Oil Consumption Diagnosis

OIL CONSUMPTION DIAGNOSIS
Excessive oil consumption (not due to leaks) is the use of 0.9L (l qt) or more of engine oil within 2 000 mi (3 200 km). 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.