99 A4...things to look for?

I recently purchased a 99 A4 2.8 Quattro 5sp with 26k miles.

Is there anything I should be looking out for that might be a problem as the miles increase?  The car I got rid of was a 98 Jetta and the big thing that I (and a lot of other VW owners who I talked to) saw was around 40k the O2 sensors started to go (and went).  Since the car was a 98 and they didn't have their new 4yr/50k warranty at that time...I had to pay for that one.  But that was the only problem I had with that car...

I purchased a 3yr/36k warranty with the A4, so I'm pretty confident that most everything would be covered.  I just want to keep an eye out for any potential issues.

Thanks.