Mechanics

AUDI A8 ENGINE PROBLEM

1999 Audi A8 • 85,000 miles

When cold fine but When warm oil pressure light comes on and bleeps and engine knocks when revved sounds like bottom end.
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Guest
February 5, 2013.



Suspect worn engine bearings. An oil pressure test with a mechanical gauge will verify the pressure really is low. Debris could be blocking the oil pickup too but the knocking indicates bearings. You can try a little higher viscosity oil. If worn bearings are the cause, the pressure will remain higher longer. If debris in the oil pan is the culprit, I suspect the thicker oil will have a harder time passing by it and the pressure will drop sooner.

Caradiodoc
Feb 5, 2013.