Incorrect oil level

An oil level that is overfull causes aeration within the oil.

Add or remove oil, as required, to achieve the proper level.

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 valve lifters, as required.

Worn crankshaft thrust bearing

1. Inspect the crankshaft end play.
2. Inspect the thrust bearing and crankshaft.
3. Repair or replace, as required.

Damaged or faulty oil filter bypass valve

1. Inspect the oil filter bypass valve for proper operation.
2. Repair or replace, as required.