Engine Noise on Start-Up, but Only Lasting a Few Seconds

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Cause	Correction
Incorrect oil filter without anti-drainback feature	Install the correct oil filter.
Incorrect oil viscosity	Drain the oil. Install the correct viscosity oil.
High valve lash adjuster leak down rate	Replace the lash adjusters as required.
Worn crankshaft thrust bearing	Inspect the thrust bearing and crankshaft. 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.
Malfunctioning camshaft position actuators - improper oil viscosity or contamination. The result is camshaft actuator locking pin does not lock	Verify correct engine oil viscosity by changing the engine oil and filter. Reevaluate the concern. Isolate the noise to a specific camshaft position actuator. Replace the camshaft actuator, oil and filter.
Excessive piston-to-cylinder bore clearance	Inspect the piston and piston skirt, connecting rod and cylinder bore. Repair or replace all damaged components.