I've read postings here about juddering in A4s with 5-speed manuals, however, this must be different (since mine is an automatic). My A4, which I recently purchased slightly used, judders consistently during light to moderate acceleration with the steering at or near left or right lock. The dealer where I went for service told me this was normal, just the quattro system kicking in. I'm not sure I buy this explination. It just doesn't seem right. Perhaps the differential locking system? Anyone have any experience with this?