WHEN COLD FINE BUT WHEN WARM OIL PRESSURE LIGHT ...

  • Tiny
  • Anonymous
  • 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.

Tuesday, February 5th, 2013 AT 4:30 PM

1 Reply

  • Tiny
  • caradiodoc
  • Expert
  • 25,451 posts

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.

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Tuesday, February 5th, 2013 AT 11:23 PM

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