Oil consumption high solution Q5

High Oil Consumption in Audi Q5 8R (2008-2017)

High oil consumption is a common issue for the Audi Q5 8R, particularly in models equipped with the 2.0 TFSI engine. This can be attributed to several factors, including engine design flaws and component wear. Here's a step-by-step guide to diagnose and address this issue.

Tools Required

• OBD-II Scanner
• Compression Tester
• Leak-down Tester
• Flashlight
• Inspection Mirror
• Torque Wrench
• Oil Catch Pan
• Basic Hand Tools (screwdrivers, socket set, etc.)

Step 1: Check for Error Codes

1. Connect OBD-II Scanner: Plug the scanner into the vehicle's diagnostic port.
2. Scan for Codes: Look for codes related to oil pressure or misfires, which could indicate oil consumption issues.

Step 2: Visual Inspection

1. Inspect for Leaks: Look around the engine bay for oil leaks, particularly around the valve cover gasket and oil pan gasket.
2. Examine PCV System: Check the Positive Crankcase Ventilation (PCV) valve for clogs or damage. A faulty PCV valve can lead to increased oil consumption.

Step 3: Compression Test

1. Remove Spark Plugs: Take out the spark plugs to access the cylinders.
2. Perform Compression Test: Use the compression tester to check each cylinder. Low compression in one or more cylinders may indicate worn piston rings or cylinder walls.

Step 4: Leak-down Test

1. Set Cylinder to TDC: Bring the piston of the cylinder being tested to Top Dead Center (TDC) on the compression stroke.
2. Perform Leak-down Test: Attach the leak-down tester and apply pressure. Listen for air escaping from the oil filler cap (piston rings) or the exhaust/intake (valve issues).

Repair Instructions

Step 1: Replace PCV Valve

1. Remove Engine Cover: Detach the engine cover to access the PCV valve.
2. Replace PCV Valve: Remove the old valve and install a new one. Reattach any hoses and ensure a secure fit.

Step 2: Address Internal Engine Components

If tests indicate piston ring or cylinder wear, more extensive repairs are necessary:

1. Disassemble Engine: Depending on the severity, you might need to remove the cylinder head and oil pan.
2. Inspect Piston Rings: Check for wear or damage. Replace if necessary.
3. Rehone Cylinders: If cylinder walls are worn, rehoning might be required to restore proper sealing.
4. Reassemble Engine: Ensure all components are torqued to specifications and seals/gaskets are replaced.

Step 3: Consider an Oil Catch Can

1. Install Oil Catch Can: This can reduce oil entering the intake system by capturing it before it reaches the intake manifold. Install it in-line with the PCV system.

Final Checks

1. Check Oil Level: Refill with the recommended oil and ensure the level is correct.
2. Monitor Consumption: Regularly check oil levels after repair to ensure the issue is resolved.
3. Test Drive: Perform a test drive and monitor for any symptoms of continued oil consumption.

Additional Considerations

• Software Update: Check with Audi for any ECU updates that might address oil consumption issues.
• Warranty/Recall: Some Q5 models may have been subject to recalls or warranty extensions for oil consumption. Verify with a dealer.

By following these steps, you should be able to diagnose and address high oil consumption in an Audi Q5 8R effectively. Always refer to the vehicle’s service manual for specific torque settings and procedures.