KYNZ

So ive been noticing that my 98 has been sounding more and more like a diesel truck these days. Im wondering if its noisy lifters or something like that...my question is, I currently use M1 0w40 oil and was curious to see if anyone knows if changing the oil to a heavier weight might quiet the noise somewhat? Ive heard that from friends with different cars and was just curious as to your experiences.

rangervr4.2

Sounded like a diesel up to about 1700 rpm. Didn't happen when the engine was cold. Switched to 15w/50 and it went away- for a while. Have since sold the car. Bob (A8CT) had the same problem with his. There's a thread or 2 on the subject.
Phil C

mAgnum8

I use 10W 40 Mobil 1 syn. for high mileage vehicles in the summer. In the winter I'll probably go to 0W 40.
My 1990 V8 quattro would make a little noise if I didn't use thicker oil specially in the summer but the car had 162K.

KYNZ

I will try 10w40 next change, to see if it quiets her down a bit.

KYNZ

so 5w40 would be better for 100K + A8s then eh? M1 or Castrol High Mileage or what?