Oil Consumption Diagnosis

Excessive oil consumption, not due to leaks, is the use of 0.9 L (1 qt) or more of engine oil within 3 200 kilometers (2,000 miles). The causes of excessive oil consumption include the following conditions:

• External oil leaks

  Tighten bolts and/or replace gaskets and oil seals as necessary.

• Incorrect oil level or improper reading of oil level indicator

  With the vehicle on a level surface, allow adequate drain down time and check for the correct oil level.

• Improper oil viscosity

  Use recommended SAE viscosity for the prevailing temperatures.

• Continuous high speed driving and/or severe usage
• Crankcase ventilation system restrictions or malfunctioning components
• Valve guides and/or valve stem oil seals worn, or the seal omitted

  Ream guides and install oversize service valves and/or new valve stem oil seals.

• Piston rings broken, improperly installed, worn, or not seated properly

  Allow adequate time for rings to seat. Replace broken or worn rings as necessary.

• Piston improperly installed or mis-fitted