Oil level too low

• Oil consumption

• External oil leak

• Worn piston rings

• Improperly installed piston rings

• Worn cylinders

• Worn valve guide

Low oil pressure

• Clogged oil strainer

• Internal oil leak

• Incorrect oil being used

IMo oil pressure

• Oil pressure relief valve stuck open

• Broken oil pump drive chain

• Broken oil pump drive or driven sprocket

• Damaged oil pump

• Internal oil leak

High oil pressure

• Oil pressure relief valve stuck closed

• Clogged oil filter, gallery or metering orifice

• Incorrect oil being used

Oil contamination

• Oil or filter not changed often enough

• Worn piston rings

Oil emulsification

• Blown cylinder head gasket

• Leaky coolant passage

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