Oil Consumption Diagnosis
Checks
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Causes
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The causes of excessive oil consumption may include the following
conditions:
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Preliminary
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| • |
Incorrect oil level or improper reading of the oil
level indicator With the vehicle on a level surface, run the engine
for a few minutes, allow adequate drain down time (2-3 minutes) and
check for the correct engine oil level. |
| • |
Improper oil viscosity Refer to the vehicle owners
manual and use the recommended SAE grade and viscosity for the
prevailing temperatures. |
| • |
Continuous high speed driving and/or severe
usage |
| • |
Crankcase ventilation system restrictions or
malfunctioning components |
| • |
Worn valve guides and/or valve stems |
| • |
Worn, missing or improperly installed valve stem
oil seals |
| • |
Piston rings broken, worn, not seated properly
Allow adequate time for the rings to seat. Replace worn piston
rings as necessary. |
| • |
Piston and rings improperly installed or
miss-fitted to the cylinder bore |
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