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Message: <blockquote data-quote="joemomma" data-source="post: 1586698" data-attributes="member: 25929">Checking back in with a new update.  Had the rear sport diff serviced with new fluids (lifetime fluid per Audi, but I ain't buying that noise) and also with more air suspension issues!  Tech said the old fluid looked/smelled fine, but it's a good piece of mind maintenance item.  The Audi sport diff uses two fluids - gear oil in one side and ATF in the other side.  Pretty wild setup.This time it's the driver side front air strut.  I knew it was going to fail at some point, and it finally did.  Went in the shop late last week for replacement as I'm not brave enough to tackle this job - there's a pinch bolt on the upper control arm that secures two upside down ball joints, and it's notorious for being a bear.  Steering clear of that guy.  Anyway, they get the new strut in and it still has a very slow leak - like after several hours it will have a bit of a lean.  The old strut was definitely bad, big hole in the rubber bag portion.  But - the shop hasn't been able to identify the leak yet.  So they've still got the car and are chasing the leak.  My guess is a "bad out of the box" replacement air strut.  If I could quit spending money on repairs I'd throw a tune on the thing and make it "felony fast".</blockquote>