SilverThing

I have a 2001.5 B5 S4 Avant w/ 81k miles. Going to do 80k mile service this week. Tip tranny is functioning fine, no issues. As part of the 80k mile maintenance work, should I flush tranny fluid & replace filter & gasket or just leave it be as is? Most of my experience is w/ BMW auto-boxes which I know are to be left alone.

Same w/ B5 S4 tip tranny? Or should I service the tip as described? Any advice/guidance would be greatly appreciated.

TIA,
Mike

Skydive@AI

Do it.

TwinTurboTerror

Yes, do it.

MikeD-9000

Then sacrifice something near and dear to you, in the hopes it doesn't fail in the next 100K anyway.

Or get a VAST/517 rebuild including torque converter, valve body, and research the clutch pack burnout issue skydive noted.

Me? Previous owner hung transmission up on a railroad track, and thrashed everything in it right before I purchased.

I'll revisit the transmission when it's fried. I don't run heavy boost over 30 seconds a week, so I have a while.

SilverThing

not a big believer in "lifetime" fluids/filters, yada, yada - to me it's like the "free maintenance" BMW, Audi and other car mfgr's are offering on their new cars (= no maintenance). Only exception is w/ BMW slushboxes, where even my trusted indy mech tells me not to service my E36 tranny until or unless it craps out (hopefully won't happen).

I'm not hard on the S4 (probably most "babied" of any car I've owned), so I hope not to have any serious tranny issues during my stewardship. Thx again.

S4_NE

Flush IT the trans will be thanking you after