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.
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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 the 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