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Oil Consumption Diagnosis

  1. Check the Closed Crankcase Ventilation (CCV) system. Make sure the system is not restricted (one way by blowing air through it) and the CCV valve is the correct part based on the part number. Check the hoses and connectors for damage or leaks. It must have correct vacuum source at intake manifold through the hose-vent assembly. Normal vacuum is considered to be 18-20 in. Hg at idle, below 3000 ft. above sea level.
  2. Perform a cylinder compression test and cylinder leakage test using the standard cylinder leakage tester and following manufacturers suggested best practices.
    NOTE:

    Blow the spark plug sockets/bores out with compressed air to remove fluid or debris before removing the spark plugs. 

  3. Verify the spark plugs are not oil saturated.
  4. If one or more cylinders have more than 15% leak down further engine tear down and inspection will be required.
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