Oil Consumption Diagnosis
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Oil Consumption Diagnosis
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Checks
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Causes
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DEFINITION: Excessive oil consumption (not due to leaks) is the use of 0.946 L (1 qt) or more of engine oil within 3 200 km (2,000 mi).
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 oil level indicator
Let the engine run a few minutes while the vehicle is parked on a level surface. Let the oil run out of the system (2-3 minutes) and check that the engine oil level is correct.
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Improper oil viscosity
Refer to the vehicle owners manual and use the recommended SAE grade and viscosity for the prevailing temperatures.
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Continuous high speed driving and/or severe usage
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Crankcase ventilation system restrictions or malfunctioning components
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Worn valve guides and/or valve stems
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Worn, missing or improperly installed valve stem oil seals
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Piston rings broken, worn, not seated properly
Allow adequate time for rings to seat.
Replace worn piston rings as necessary.
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Piston and rings improperly installed or miss-fitted to the cylinder bore
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