If you do a fluid change, beware that there is a prescribed amount and method of checking levels. The issue being quantity of fluid. Too much resulting in damage, which it is very easy to overfill unknowingly. Most cars don't have the dip stick in the transmission. Helpful to Audi servicing years back, but not so much help now.
I purchased a dipstick for mine. (Audi parts, wasn't too pricey)

85 WR quattro
90 V8 Silver, 91 V8 Black, 93 V8 Lago
93 100e quattro V6. Titan, i think