1993 90S - Buy or not

[DSAdams@aol.com]

We are nearing the end of a 42 month lease on the car
described in the subject.  It has 53,000 miles and has
been mostly trouble free.  We are trying to decide whether
or not to purchase the car.  The residual value is $11,600.
The car has auto trans, sunroof as options.  

What are the things to look for as possible problem areas
on this car.  It has been maintained on the Audi schedule
(oil chgs every 7500 miles).  No real problems yet but
wondering what problems are typical for this car and how
long we might realistically expect it to last.

Thanks,
Dave Adams
'96 A4
'93 90S