For 1990-2009 cars

Cause | Correction
--- | ---
Incorrect oil filter without anti-drainback feature | Install the correct oil filter.
Incorrect oil viscosity |

1. Drain the oil.
2. Install the correct viscosity oil.

High valve lifter leak down rate | Replace the lifters as required.
Worn crankshaft thrust bearing |

• | Inspect the thrust bearing and crankshaft. Refer to Crankshaft and Bearing Cleaning and Inspection .

• | Repair or replace as required.

Damaged or faulty oil filter by-pass valve |

• | Inspect the oil filter by-pass valve for proper operation.

• | Repair or replace as required.

Damaged or faulty oil control valve |

• | Inspect the oil control valve for proper operation.

• | Repair or replace as required.