In Reply to: Re: Anyone else have problems with Redline 10W40? posted by dbruce on May 16, 2001 at 22:33:35:
What weight oil is the BMW stuff. I believe 10W30 which is a lighter weight oil and flows better when warm.
I believe any 10W40 will cause the problems you describe.
I suggest trying 5W30 or 0W30 racing oils from Amsoil, Royal Purple or Redline (doubt you will choose this brand though).
The Vanos unit is known for making noise. Sounds like the higher weight oil just amplified the sound.
I had Redline 10W40 installed in my '00 M coupe last Thursday and noticed a slight buzzing coming from the engine area when I picked it up. As the engine warms, the noise becomes worse, and is most evident while the rpms are dropping in range of 1500 rpm down to 1000 rpm.
Apparently the Vanos unit is the problem. My dealer has drained the oil and replaced it with BMW 5W30 and the noise has either gone away or lessened. I'll be driving it tonight to personally determine the results.
I spoke with Redline and they explained they have no record of any problems with their 10W40 and the 3.2l M motor.
Now I suspect that the Vanos unit is indeed failing, but the problem is masked by some slight difference between the two oils. This is really a no-win situation for me. If the unit fails, Redline will deny responsibility and BMW may likewise claim it is my fault for using non-BMW oil.
I'd love to hear all positive or negative experience with Redline 10W40 synthetic oil and our 3.2l motors.