I've been in the BMW world for over 10 years. Looking to get into a wagon and looking at an A4 Avant or BMW 525/528. I know what to look for on the BMW, but know absolutely nothing on the Audi side of things.
Thought I would find a sticky in this forum about common mechanical issues, what to watch for, mechanical issues, what to replace at certain mileages, etc, but didn't see it.
yeah, VW/Audi requires 504.00 & 507.00 specs and only synthetic. I personally use Pentosin, but there are other brands you can use. Just flip the bottle over and check for the VW/Audi 504.00/507.00
ETC sensor is like $10, not super easy to change, but not bad.
Speaking of fluids and ETC, VW/Audi requires special fluid in just about every system. Even though it takes special fluids they are not crazy expensive and fairly easy to come by (at least here in Toledo, OH)