What oil to use in your Engine, Trans, Diff?

[wbradley]

I have read that high ZDDP levels sometimes damage the cats.

[Hagbard]

AMSOil in motor last 2 changes i do have amsoil gear oil for the dif and tranny but not in any hurry to change that right now.

[krayzie]

Originally Posted by wbradley

I have read that high ZDDP levels sometimes damage the cats.

Ah okay that explains that rotten egg smell I used to get after an oil change.

I've read that competition oils like Motul 300V is really bad for the cat.

Had no choice cuz the early VAG 2.0T came with a flat tappet cam follower and without adequate ZDDP the high pressure fuel pump will punch a hole thru it, destroying the camshaft lobe in the process. That engine also tend to burn a lot of oil when running Mobil 1 0W40 or Castrol SLX 5W40 compare to Motul 8100 5W40.

FA20 I think Mobil 1 0W40 should be okay since this engine doesn't burn oil even with a light oil like 0W20. I think Mobil 1 always comes out all black during an oil change which to me means it holds dirt very well in suspension. I understand Mobil 1 also comes in a 5W50 weight.

[Dru670]

How is that RP in your trans and diff so far? Planning on trying RP for my trans and diff also.

Originally Posted by JEDI

I used Royal Purple 0w-20 for engine.
Royal Purple 75w-90 for both Trans and Diff.


Here's a pic of my Differential Drain Plug after 9900 miles.
I bought the car with 9560. I'm hearing this is common in our cars, but not fact. Sorry for the huge pic.