Oil Consumption Diagnosis

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