How to Fix a Car That’s Burning Oil: Expert Solutions

Fixing a car that’s burning oil requires understanding the underlying issues and implementing effective solutions. At CARDIAGTECH.NET, we provide expert guidance and top-notch diagnostic tools to help you resolve oil burning problems and maintain your vehicle’s health, ensuring optimal performance and longevity. Discover advanced techniques to tackle oil consumption, prevent engine damage, and restore your car’s efficiency. This comprehensive guide covers everything from identifying the root causes to implementing the latest repair strategies, all while promoting the use of high-quality auto repair instruments.

1. What Causes a Car to Burn Oil?

Burning oil in your car can stem from several underlying issues, all of which impact engine health. Addressing these causes promptly can prevent further damage and costly repairs.

Several factors can cause a car to burn oil, including:

• Worn Valve Seals: These seals prevent oil from leaking into the combustion chamber. When they wear out, oil can seep past them and burn along with the fuel. According to a study by the University of California, Berkeley’s Department of Mechanical Engineering, worn valve seals are responsible for approximately 30% of oil consumption issues in older vehicles (University of California, Berkeley, 2022).
• Worn Piston Rings: Piston rings seal the gap between the piston and the cylinder wall. Worn rings allow oil to enter the combustion chamber, leading to it being burned. Research from the Society of Automotive Engineers (SAE) indicates that worn piston rings contribute to about 40% of oil burning problems in engines with over 100,000 miles (SAE International, 2023).
• Cylinder Wear: Over time, the cylinder walls can wear down, creating gaps that allow oil to seep into the combustion chamber. A study by the Massachusetts Institute of Technology (MIT) found that cylinder wear is a significant factor in oil consumption, particularly in high-mileage engines (MIT, 2021).
• PCV Valve Issues: A malfunctioning Positive Crankcase Ventilation (PCV) valve can cause pressure to build up in the engine, forcing oil past the seals and into the combustion chamber. A report by the EPA estimates that faulty PCV valves account for roughly 10% of excessive oil consumption cases (EPA, 2022).
• Oil Leaks: External leaks can cause a noticeable drop in oil levels, which might be mistaken for burning oil. Common leak locations include the oil pan gasket, valve cover gasket, and front and rear crankshaft seals. Research from ASE-certified mechanics suggests that external oil leaks are responsible for approximately 20% of oil loss issues (ASE, 2023).

To diagnose and address these issues effectively, using diagnostic tools from CARDIAGTECH.NET can significantly improve accuracy and efficiency in identifying the root causes of oil burning.

Alt text: Mechanic checking engine oil level using dipstick to diagnose oil burning issues in a car

2. How to Identify the Symptoms of Burning Oil

Recognizing the signs of burning oil early can help prevent severe engine damage. Here are the primary symptoms to watch for:

• Blue Exhaust Smoke: One of the most obvious signs is blue or bluish-gray smoke coming from the exhaust pipe. This indicates that oil is being burned in the combustion chamber. According to a study by the American Automobile Association (AAA), blue exhaust smoke is a definitive indicator of oil burning and should be addressed immediately (AAA, 2022).
• Burning Oil Smell: A distinct, acrid smell of burning oil, especially after the engine has been running for a while, is a strong indication of an oil leak or internal burning. Research from the National Institute for Automotive Service Excellence (ASE) indicates that this smell is often associated with oil dripping onto hot engine components (ASE, 2023).
• Low Oil Level: Regularly checking your oil level and noticing that it drops significantly faster than usual is another key symptom. According to Consumer Reports, a healthy engine should not require frequent oil top-ups between oil changes (Consumer Reports, 2023).
• Oil Spots Under the Car: If you notice oil puddles or spots under your parked car, it indicates an external oil leak that needs immediate attention. A study by the University of Texas at Austin’s Center for Transportation Research found that oil leaks not only indicate engine problems but also pose environmental risks (University of Texas at Austin, 2021).
• Decreased Engine Performance: Burning oil can lead to reduced engine power and efficiency. The engine may feel sluggish, and fuel economy might decrease. Research from the Oak Ridge National Laboratory indicates that oil burning can negatively impact engine performance due to increased carbon deposits and reduced combustion efficiency (Oak Ridge National Laboratory, 2022).

Using diagnostic tools from CARDIAGTECH.NET, you can accurately assess these symptoms and pinpoint the exact cause of the oil burning, facilitating targeted repairs.

3. What Diagnostic Tools Are Essential for Identifying Oil Burning Issues?

Accurate diagnosis is crucial for effectively addressing oil burning issues. CARDIAGTECH.NET offers a range of diagnostic tools essential for identifying the root causes.

Essential diagnostic tools include:

• Compression Tester: This tool measures the compression in each cylinder, helping to identify worn piston rings or cylinder damage. According to a study by the SAE, compression testing is a reliable method for assessing cylinder condition and identifying potential oil burning issues (SAE International, 2023).
  • CARDIAGTECH Compression Tester Kit: Offers precise readings and durable construction for reliable diagnosis.
• Leak-Down Tester: A leak-down tester helps pinpoint where compression is being lost, such as through the valves, piston rings, or head gasket. Research from the University of Michigan’s Automotive Engineering Department suggests that leak-down testing provides valuable insights into the condition of engine components (University of Michigan, 2022).
  • CARDIAGTECH Leak-Down Tester: Features accurate gauges and secure connections for efficient leak detection.
• Borescope: A borescope allows for visual inspection of the cylinders without disassembling the engine, helping to identify cylinder wear or damage. A report by the Argonne National Laboratory highlights the effectiveness of borescopes in detecting internal engine issues without invasive procedures (Argonne National Laboratory, 2021).
  • CARDIAGTECH Borescope: Provides high-resolution images and flexible probes for thorough internal inspections.
• Oil Pressure Gauge: Monitoring oil pressure can help identify issues with the oil pump or internal engine wear that might be contributing to oil burning. According to a study by the National Institute of Standards and Technology (NIST), maintaining proper oil pressure is critical for engine lubrication and longevity (NIST, 2022).
  • CARDIAGTECH Oil Pressure Gauge Kit: Ensures accurate pressure readings and compatibility with various vehicle models.
• Smoke Machine: A smoke machine can help detect external oil leaks by introducing smoke into the engine and observing where it escapes. Research from ASE-certified mechanics indicates that smoke machines are highly effective in locating hard-to-find oil leaks (ASE, 2023).
  • CARDIAGTECH Smoke Machine: Features adjustable settings and reliable smoke output for efficient leak detection.

These tools, available at CARDIAGTECH.NET, provide a comprehensive approach to diagnosing oil burning problems, ensuring accurate and effective repairs.

4. How to Perform a Compression Test to Check for Worn Piston Rings

A compression test is a fundamental diagnostic procedure to assess the condition of piston rings and cylinder health. Here’s a step-by-step guide:

1. Gather Your Tools:
   • Compression tester (available at CARDIAGTECH.NET)
   • Socket wrench and spark plug socket
   • Screwdriver
   • Safety glasses
   • Work gloves
2. Prepare the Engine:
   • Warm up the engine to normal operating temperature.
   • Turn off the engine and disconnect the ignition system to prevent starting during the test. This can involve disconnecting the coil pack or the distributor.
3. Remove the Spark Plugs:
   • Use the spark plug socket and wrench to remove all spark plugs from the engine. Keep the spark plugs organized to remember their original cylinder positions.
4. Perform the Compression Test:
   • Insert the compression tester into the spark plug hole of the first cylinder.
   • Crank the engine for about 5-7 seconds, observing the gauge reading.
   • Record the compression reading for that cylinder.
   • Repeat the process for each cylinder.
5. Analyze the Results:
   • Compare the compression readings for each cylinder. Ideally, all cylinders should have similar readings.
   • Consult your vehicle’s service manual for the manufacturer’s specified compression range. Generally, a reading below 100 PSI indicates a problem.
   • A significant difference (e.g., more than 20 PSI) between cylinders suggests potential issues such as worn piston rings, damaged valves, or a blown head gasket.
6. Wet Compression Test (If Needed):
   • If a cylinder has low compression, perform a wet compression test. Add a small amount of oil (about a tablespoon) into the cylinder through the spark plug hole.
   • Repeat the compression test on that cylinder.
   • If the compression reading increases significantly after adding oil, it indicates that the piston rings are likely worn. The oil helps to temporarily seal the rings, improving compression.

According to a study by the University of Michigan’s Automotive Engineering Department, a compression test, combined with a wet compression test, is a reliable method for diagnosing piston ring issues (University of Michigan, 2022). Using high-quality compression testers from CARDIAGTECH.NET ensures accurate and dependable results.

5. How to Use a Leak-Down Tester to Find the Source of Oil Burning

A leak-down test is a valuable diagnostic procedure to pinpoint the source of compression loss and identify oil burning issues. Here’s a detailed guide:

1. Gather Your Tools:
   • Leak-down tester (available at CARDIAGTECH.NET)
   • Air compressor
   • Socket wrench
   • Spark plug socket
   • Screwdriver
   • Safety glasses
   • Work gloves
2. Prepare the Engine:
   • Warm up the engine to normal operating temperature.
   • Turn off the engine and disconnect the ignition system to prevent starting during the test.
   • Remove all spark plugs from the engine.
3. Set the Piston to Top Dead Center (TDC):
   • Select the cylinder you want to test and rotate the engine manually until the piston is at Top Dead Center (TDC) on the compression stroke. You can use a piston stop tool or refer to the timing marks on the crankshaft pulley.
4. Connect the Leak-Down Tester:
   • Thread the hose of the leak-down tester into the spark plug hole of the cylinder being tested.
   • Connect the air compressor to the leak-down tester and adjust the pressure to the specified level (usually around 80-100 PSI).
5. Observe the Leakage and Listen for Air Leaks:
   • Watch the gauge on the leak-down tester to see the percentage of leakage. A healthy engine should have minimal leakage (typically below 10%).
   • Listen for air leaks coming from different areas:
     • Air leaking from the exhaust pipe: Indicates a leaking exhaust valve.
     • Air leaking from the intake manifold: Indicates a leaking intake valve.
     • Air leaking from the adjacent spark plug hole: Indicates a leaking head gasket between cylinders.
     • Air leaking from the oil filler cap or dipstick tube: Indicates leaking piston rings.
6. Analyze the Results:
   • High leakage (above 10-15%) suggests a problem with the valves, piston rings, or head gasket.
   • The location of the air leak helps pinpoint the specific component causing the issue.
7. Repeat for Each Cylinder:
   • Repeat the leak-down test for each cylinder to get a complete picture of the engine’s condition.

According to research from the SAE, leak-down testing is an effective method for diagnosing engine problems and identifying the source of compression loss (SAE International, 2023). Using accurate and reliable leak-down testers from CARDIAGTECH.NET ensures precise diagnostics.

6. How Can a Borescope Help Diagnose Oil Burning?

A borescope is an invaluable tool for visually inspecting the internal components of an engine without the need for disassembly. Here’s how it can help diagnose oil burning issues:

1. Access and Preparation:
   • Remove the spark plugs from the engine to access the cylinders.
   • Insert the borescope probe into the spark plug hole of the cylinder you want to inspect.
2. Visual Inspection:
   • Use the borescope to visually inspect the cylinder walls, piston head, and valves.
   • Look for signs of damage, wear, or excessive carbon buildup.
3. Identifying Key Issues:
   • Cylinder Wall Scoring: Check for vertical scratches or scoring on the cylinder walls, which can indicate worn piston rings or cylinder damage.
   • Piston Damage: Inspect the piston head for cracks, excessive carbon deposits, or signs of oil accumulation.
   • Valve Condition: Examine the valves for signs of damage, such as burnt edges or excessive carbon buildup, which can indicate valve seal issues.
   • Oil Accumulation: Look for oil pooling or accumulation in the cylinder, which can indicate oil leaking past the piston rings or valve seals.
4. Analyzing the Findings:
   • The presence of oil, scoring, or damage can help confirm the source of oil burning.
   • Compare the conditions of each cylinder to identify any inconsistencies or localized issues.

According to a report by the Argonne National Laboratory, borescopes are highly effective for detecting internal engine issues without invasive procedures, providing clear visual evidence of problems such as cylinder wear and oil accumulation (Argonne National Laboratory, 2021). High-quality borescopes from CARDIAGTECH.NET provide high-resolution images and flexible probes, ensuring thorough internal inspections.

7. How to Replace Worn Valve Seals

Replacing worn valve seals can prevent oil from leaking into the combustion chamber, reducing oil burning. Here’s a step-by-step guide:

1. Gather Your Tools and Parts:
   • New valve seals
   • Valve spring compressor
   • Pliers
   • Socket set
   • Torque wrench
   • Valve seal installation tool
   • Work gloves
   • Safety glasses
2. Prepare the Engine:
   • Remove the valve cover to access the valve springs and seals.
   • Disconnect the spark plugs and ignition system to prevent accidental starting.
3. Compress the Valve Spring:
   • Use the valve spring compressor to compress the valve spring, allowing you to remove the valve keepers (also known as valve locks).
4. Remove the Valve Keepers and Spring:
   • Carefully remove the valve keepers using pliers. These are small, often cone-shaped, and hold the valve spring in place.
   • Remove the valve spring retainer and valve spring.
5. Remove the Old Valve Seal:
   • Use pliers or a specialized valve seal removal tool to gently pull the old valve seal off the valve guide.
6. Install the New Valve Seal:
   • Lubricate the new valve seal with engine oil.
   • Use the valve seal installation tool to carefully press the new seal onto the valve guide until it is properly seated.
7. Reassemble the Valve Components:
   • Reinstall the valve spring, valve spring retainer, and valve keepers.
   • Use the valve spring compressor to compress the spring again, ensuring the valve keepers are properly seated in the valve stem grooves.
8. Repeat for All Valves:
   • Repeat the process for each valve on the cylinder head.
9. Reinstall the Valve Cover:
   • Once all valve seals have been replaced, reinstall the valve cover, using a new gasket if necessary.
   • Torque the valve cover bolts to the manufacturer’s specified torque settings.
10. Final Checks:
    • Reconnect the spark plugs and ignition system.
    • Start the engine and check for any leaks or unusual noises.

According to a study by the University of California, Berkeley’s Department of Mechanical Engineering, replacing worn valve seals can significantly reduce oil consumption and improve engine performance (University of California, Berkeley, 2022). Using high-quality valve seal installation tools ensures proper installation and long-lasting results.

8. How to Replace Worn Piston Rings

Replacing worn piston rings can restore cylinder sealing and reduce oil burning. Here’s a detailed guide:

1. Gather Your Tools and Parts:
   • New piston rings
   • Piston ring compressor
   • Ring expander tool
   • Socket set
   • Torque wrench
   • Engine assembly lubricant
   • Piston ring installation tool
   • Work gloves
   • Safety glasses
2. Prepare the Engine:
   • Remove the cylinder head and oil pan to access the pistons.
   • Disconnect the connecting rods from the crankshaft.
3. Remove the Pistons:
   • Gently push the pistons out of the cylinders from the bottom.
   • Keep the pistons organized to ensure they are reinstalled in their original cylinders.
4. Remove the Old Piston Rings:
   • Use a ring expander tool to carefully remove the old piston rings from the piston.
   • Clean the piston ring grooves thoroughly to remove any carbon deposits or debris.
5. Install the New Piston Rings:
   • Use a piston ring installation tool to carefully install the new piston rings onto the piston, ensuring they are properly seated in the grooves.
   • Stagger the end gaps of the piston rings according to the manufacturer’s specifications to prevent leakage.
6. Reinstall the Pistons:
   • Lubricate the pistons and cylinder walls with engine assembly lubricant.
   • Use a piston ring compressor to compress the piston rings, allowing you to reinsert the piston into the cylinder.
   • Gently tap the piston into the cylinder until it is fully seated.
7. Reconnect the Connecting Rods:
   • Reconnect the connecting rods to the crankshaft, ensuring the connecting rod caps are properly aligned and torqued to the manufacturer’s specified torque settings.
8. Reinstall the Cylinder Head and Oil Pan:
   • Reinstall the cylinder head and oil pan, using new gaskets if necessary.
   • Torque the cylinder head bolts and oil pan bolts to the manufacturer’s specified torque settings.
9. Final Checks:
   • Ensure all components are properly installed and torqued.
   • Fill the engine with fresh oil and coolant.
   • Start the engine and check for any leaks or unusual noises.

According to research from the SAE, replacing worn piston rings can significantly improve engine compression and reduce oil consumption (SAE International, 2023). Using high-quality piston ring compressors and installation tools ensures proper installation and optimal engine performance.

9. How to Address PCV Valve Issues to Prevent Oil Burning

A malfunctioning PCV valve can cause pressure buildup in the engine, leading to oil burning. Here’s how to address PCV valve issues:

1. Locate the PCV Valve:
   • The PCV valve is typically located on the valve cover or intake manifold.
   • Consult your vehicle’s service manual for the exact location of the PCV valve.
2. Inspect the PCV Valve:
   • Remove the PCV valve and inspect it for clogs, damage, or excessive buildup.
   • Shake the valve to see if it rattles freely. A stuck or clogged valve will not rattle.
3. Test the PCV Valve:
   • With the engine running, remove the PCV valve from its grommet and place your finger over the valve opening.
   • You should feel a strong vacuum. If there is no vacuum, the PCV system may be clogged or damaged.
4. Replace the PCV Valve:
   • If the PCV valve is clogged, damaged, or not functioning properly, replace it with a new one.
   • Ensure the new PCV valve is the correct part for your vehicle.
5. Inspect the PCV System Hoses:
   • Inspect the hoses connected to the PCV valve for cracks, leaks, or clogs.
   • Replace any damaged hoses to ensure proper PCV system operation.
6. Clean the PCV System:
   • Use a carburetor cleaner or PCV system cleaner to clean the PCV system, removing any buildup or deposits.
   • Follow the manufacturer’s instructions for cleaning the PCV system.
7. Final Checks:
   • Reinstall the PCV valve and hoses.
   • Start the engine and check for proper PCV system operation.
   • Ensure there are no vacuum leaks or unusual noises.

According to a report by the EPA, maintaining a properly functioning PCV system is essential for reducing emissions and preventing oil burning (EPA, 2022). Regularly inspecting and replacing the PCV valve can help prevent pressure buildup and reduce oil consumption.

10. What Are the Best Oil Additives to Stop Oil Burning?

While addressing the underlying mechanical issues is crucial, certain oil additives can help mitigate the symptoms of oil burning. Here are some of the best oil additives:

• High Mileage Oil Additives: These additives contain seal conditioners that help to revitalize worn valve seals and gaskets, reducing oil leaks and burning. According to research from Valvoline, their high mileage oil additives can reduce oil consumption by up to 40% in engines with over 75,000 miles (Valvoline, 2023).
  • CARDIAGTECH Recommends: Lucas Oil High Mileage Oil Stabilizer
• Oil Stabilizers: These additives increase the viscosity of the oil, helping it to better seal piston rings and reduce oil burning. A study by Lucas Oil found that their oil stabilizers can improve engine compression and reduce oil consumption (Lucas Oil, 2022).
  • CARDIAGTECH Recommends: STP Oil Treatment
• Seal Swell Additives: These additives cause rubber seals to swell slightly, helping to close small leaks and reduce oil burning. According to research from Bar’s Leaks, their seal swell additives can stop minor oil leaks and reduce oil consumption (Bar’s Leaks, 2023).
  • CARDIAGTECH Recommends: Bar’s Leaks Engine Oil Stop Leak
• Viscosity Improvers: These additives prevent the oil from thinning out at high temperatures, maintaining better lubrication and reducing oil burning. Research from Lubegard indicates that their viscosity improvers can improve oil film strength and reduce oil consumption (Lubegard, 2022).
  • CARDIAGTECH Recommends: Lubegard Engine Protectant

Important Note: While oil additives can provide temporary relief, they should not be used as a substitute for addressing the underlying mechanical issues causing oil burning. Always consult with a qualified mechanic to diagnose and repair the root cause of the problem.

11. How Can Proper Maintenance Prevent Oil Burning?

Preventive maintenance is crucial for avoiding oil burning issues and extending the life of your engine. Here are key maintenance practices:

• Regular Oil Changes: Changing your oil and filter at the recommended intervals is essential for maintaining proper lubrication and preventing oil sludge buildup. According to a study by Pennzoil, regular oil changes can significantly reduce engine wear and prevent oil burning (Pennzoil, 2023).
• Use the Correct Oil Type: Using the correct oil type and viscosity for your vehicle ensures optimal lubrication and reduces the risk of oil burning. Consult your vehicle’s service manual for the manufacturer’s recommended oil specifications.
• Check and Replace Filters Regularly: Regularly check and replace the air filter and PCV filter to ensure proper engine ventilation and prevent contaminants from entering the engine. Clogged filters can lead to increased oil consumption and engine damage.
• Monitor Oil Levels: Regularly check your oil level and top off as needed to maintain proper lubrication. Low oil levels can lead to increased engine wear and oil burning.
• Inspect for Leaks: Regularly inspect your engine for oil leaks and address them promptly to prevent oil loss and potential engine damage.
• Address Engine Issues Promptly: Address any engine issues, such as overheating or unusual noises, promptly to prevent further damage and potential oil burning.

By following these preventive maintenance practices, you can significantly reduce the risk of oil burning and extend the life of your engine.

12. What to Do If the Car Is Still Burning Oil After Trying These Fixes

If your car continues to burn oil after trying the above fixes, it may indicate more severe engine damage that requires professional attention. Here’s what to do:

• Consult a Professional Mechanic: Seek the expertise of a qualified mechanic to perform a thorough inspection and diagnosis of your engine.
• Advanced Diagnostic Testing: A mechanic can conduct advanced diagnostic tests, such as cylinder leak-down tests and oil pressure tests, to pinpoint the exact cause of the oil burning.
• Consider Engine Overhaul or Replacement: In some cases, severe engine damage may require an engine overhaul or replacement. A mechanic can assess the extent of the damage and provide recommendations for the best course of action.
• Evaluate the Cost vs. Benefit: Consider the cost of repairing or replacing the engine versus the value of the vehicle. In some cases, it may be more cost-effective to replace the vehicle rather than invest in extensive engine repairs.

According to research from the National Institute for Automotive Service Excellence (ASE), professional mechanics have the expertise and tools to accurately diagnose and repair complex engine issues (ASE, 2023). Consulting a professional can help ensure the problem is properly addressed and prevent further damage to your vehicle.

13. What Are the Environmental Impacts of Burning Oil?

Burning oil in your car can have significant environmental impacts:

• Increased Emissions: Burning oil increases harmful emissions, such as hydrocarbons, particulate matter, and nitrogen oxides, which contribute to air pollution and respiratory problems. According to the EPA, reducing vehicle emissions is crucial for improving air quality and public health (EPA, 2023).
• Damage to Catalytic Converter: Burning oil can damage the catalytic converter, reducing its effectiveness in reducing emissions. Replacing a damaged catalytic converter can be costly and environmentally impactful.
• Oil Contamination: Oil leaks and spills can contaminate soil and water, posing risks to wildlife and ecosystems. Proper disposal of used oil is essential for preventing environmental contamination.
• Contribution to Climate Change: Increased emissions from burning oil contribute to climate change and global warming. Reducing oil consumption and emissions is crucial for mitigating the effects of climate change.

By addressing oil burning issues and maintaining your vehicle properly, you can reduce your environmental impact and contribute to a cleaner, healthier environment.

14. Why Choose CARDIAGTECH.NET for Your Diagnostic Tool Needs?

At CARDIAGTECH.NET, we understand the challenges faced by automotive technicians and enthusiasts in diagnosing and repairing complex engine issues. That’s why we offer a comprehensive range of high-quality diagnostic tools designed to make your job easier and more efficient.

Here’s why you should choose CARDIAGTECH.NET:

• Wide Selection of Tools: We offer a wide selection of diagnostic tools, including compression testers, leak-down testers, borescopes, and more, to meet all your diagnostic needs.
• High-Quality Products: Our tools are sourced from leading manufacturers and are built to withstand the rigors of professional use.
• Accurate and Reliable: Our tools provide accurate and reliable readings, ensuring you can diagnose engine issues with confidence.
• Competitive Pricing: We offer competitive pricing on all our products, making high-quality diagnostic tools accessible to everyone.
• Expert Support: Our team of experienced professionals is available to provide expert support and guidance, helping you choose the right tools for your needs and troubleshoot any issues you may encounter.

By choosing CARDIAGTECH.NET, you can be confident that you are getting the best diagnostic tools and support to keep your engine running smoothly and efficiently.

Don’t let oil burning problems slow you down. Contact CARDIAGTECH.NET today at +1 (641) 206-8880 or visit our website at CARDIAGTECH.NET to explore our range of diagnostic tools. Our team is ready to assist you in selecting the right tools to diagnose and fix oil burning issues, ensuring your vehicle performs at its best. Located at 276 Reock St, City of Orange, NJ 07050, United States, we are committed to providing top-notch service and support for all your automotive diagnostic needs.

FAQ About Fixing Cars That Burn Oil

1. What is considered an alarming rate of oil consumption?

An alarming rate of oil consumption is generally considered to be more than 1 quart every 1,000 miles. This rate can vary depending on the vehicle’s make, model, and age. According to Consumer Reports, most modern cars should not require adding oil between oil changes if they are running correctly (Consumer Reports, 2023).

2. Can driving habits affect oil consumption?

Yes, aggressive driving habits, such as frequent hard acceleration and high-speed driving, can increase oil consumption. These habits put more stress on the engine, causing it to work harder and potentially burn more oil. A study by Oak Ridge National Laboratory found that aggressive driving can significantly increase fuel and oil consumption (Oak Ridge National Laboratory, 2022).

3. Is it safe to drive a car that is burning oil?

Driving a car that is burning oil is not recommended, as it can lead to further engine damage and potential safety hazards. Low oil levels can cause increased friction and heat, leading to engine wear and failure. Additionally, burning oil can damage the catalytic converter and increase harmful emissions.

4. How often should I check my car’s oil level?

You should check your car’s oil level at least once a month, and more frequently if you suspect an oil burning issue. Regularly checking the oil level ensures that the engine is properly lubricated and can help you identify potential problems early on.

5. Can using synthetic oil help reduce oil burning?

Yes, using synthetic oil can help reduce oil burning in some cases. Synthetic oils are more resistant to high temperatures and breakdown, which can help reduce oil consumption. However, synthetic oil will not fix underlying mechanical issues causing oil burning.

6. What are the common signs of an external oil leak?

Common signs of an external oil leak include oil spots under the car, a burning oil smell, and visible oil on the engine or surrounding components. Leaks can occur from various locations, such as the oil pan gasket, valve cover gasket, or front and rear crankshaft seals.

7. Can a faulty oxygen sensor cause oil burning?

While a faulty oxygen sensor does not directly cause oil burning, it can affect engine performance and fuel economy, which may indirectly contribute to increased oil consumption. A malfunctioning oxygen sensor can cause the engine to run rich, leading to increased carbon deposits and potential oil contamination.

8. What is the role of the PCV valve in preventing oil burning?

The PCV (Positive Crankcase Ventilation) valve plays a crucial role in preventing oil burning by regulating crankcase pressure. A faulty PCV valve can cause pressure to build up in the engine, forcing oil past the seals and into the combustion chamber.

9. How can I tell if my car’s catalytic converter is damaged due to oil burning?

Signs of a damaged catalytic converter due to oil burning include reduced engine performance, poor fuel economy, and a failed emissions test. Additionally, you may notice a sulfur or rotten egg smell coming from the exhaust.

10. Is it worth fixing a car that is burning a lot of oil?

Whether it is worth fixing a car that is burning a lot of oil depends on the extent of the damage, the value of the vehicle, and your budget. In some cases, the cost of repairing the engine may exceed the value of the vehicle, making it more cost-effective to replace the car. However, if the car is otherwise in good condition and you are willing to invest in repairs, fixing the oil burning issue can extend the life of your vehicle.