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 clearance adjuster leak down rate

Replace the clearance adjusters as required.

Worn crankshaft thrust bearing

1. Inspect the thrust bearing and crankshaft.
2. Repair or replace as required.

Damaged or faulty oil filter by-pass valve

1. Inspect the oil filter by-pass valve for proper operation.
2. Repair or replace as required.

Malfunctioning camshaft position actuators - improper oil viscosity or contamination. The result is camshaft actuator locking pin does not lock

1. Verify correct engine oil viscosity by changing the engine oil and filter. Re-evaluate the concern.
2. Isolate the noise to a specific camshaft position actuator.
3. Replace the camshaft actuator, oil and filter.