Oil Consumption Diagnosis

Excessive oil consumption, not due to leaks, is the use of 1 liter (1 quart) of engine oil within 3 200 kilometers (2,000 miles). However, during initial engine break-in periods 4 828-6 437 kilometers (3,000-4,000 miles), oil consumption may exceed 1 liter (1 quart) or more. The causes of excessive oil consumption include the following conditions:

• External oil leaks

  Tighten the 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, damaged, or the seal omitted

  Ream the valve 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 the piston rings to seat.

  Replace broken or worn piston rings as necessary.

• Piston improperly installed or miss-fitted