For 1990-2009 cars

Cause | Correction
--- | ---
Incorrect engine oil, viscosity | Install the correct engine oil and oil filter
Incorrect oil filter, without anti-drainback feature. | Install the correct engine oil and oil filter.
Worn, damaged, or improperly installed oil filter by-pass valve |

1. Inspect the oil filter by-pass valve.
2. Repair or replace damaged components as required.

High valve lifter leak down rate |

1. Inspect the valve lifters.
2. Repair or replace damaged components as required.

Worn, damaged, or improperly installed crankshaft thrust bearing |

1. Inspect the crankshaft.
2. Inspect the crankshaft thrust bearing.
3. Repair or replace damaged components as required.