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Home >> Jaguar >> 2019 >> XF S >> Repair and Diagnosis >> External Pages >> Different car >> Section 257 (Engine System - General Information -- XE/(760)) >> Engine System - General Information >> Diagnosis And Testing >> Engine - V6 S/C 3.0L Petrol (G1829958) >> Component Test - Oil Consumption Test >> Test Procedure

Test Procedure

WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

The following diagnostic procedure is used to determine the source of excessive oil consumption.

NOTE: Oil use is normally greater during the first 16, 100 km (10, 000 miles) of service. As mileage increases, oil use decreases. High speed driving, towing, high ambient temperature and other factors may result in greater oil use.
  1. Define excessive consumption, such as the number of miles driven per liter of oil used. Also determine customers driving habits, such as sustained high speed operation, towing, extended idle and other considerations.
  2. Verify that the engine has no external oil leaks as described under Engine Oil Leaks in this article.
  3. Carry out an oil consumption test:
    1. Run the engine to normal operating temperature. Switch engine OFF and allow oil to drain back for at least five minutes.
    2. With vehicle parked on level surface, check the engine oil level.
    3. If required, add engine oil to set level exactly to the FULL mark.
    4. Record the vehicle mileage.
    5. Instruct the customer to return for a level check after driving the vehicle as usual for 1, 610 km (1000 miles).
    6. Check the oil level under the same conditions and at the same location as the initial check.
    NOTE: If the oil consumption rate is unacceptable go to Step 4.
  4. Check the Positive Crankcase Ventilation (PCV) system. Make sure the system is not plugged.
  5. Check for plugged oil drain-back holes in the cylinder head and cylinder block.
  6. If the condition still exists after carrying out the above tests go to step  9 .
  7. Carry out a cylinder compression test. Refer to the Cylinder Compression Test procedure in this article. This can help determine the source of oil consumption such as valves, piston rings or other areas.
  8. Check valve guides for excessive guide clearance. Install new valve stem seals after verifying valve guide clearance.
  9. Worn or damaged internal engine components can cause excessive oil consumption. Small deposits of oil on the tips of the spark plugs can be a clue to internal oil consumption.
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