How many of you know if Audi always used synthetic oil in the B5 S4's or just switched to sythetic when VW did on the 1.8t. If any of you have your service manual or remeber owning yours since it was new let me know please.

 

I would say regaurdless, always run synthetic in your B5 S4. especialy with the turbos. I usualy go with a 5-40 in the summer and a 5-30 in the winter (mobile 1).

 

always fully synthetic

 

Synth from the factory. Audi used Synthetic way before VW figured it out.