I used MaxLife when I did a drain and fill on my 1994 A4LD, but it was just one drain and fill so less fluid changed. I had no shifting issues before or after. No slipping, hesitation, or anything like that. This does make me wonder if using something else would be better than introducing more MaxLife next time though.
MaxLife is a lower viscosity fluid than the regular Dex/Merc, which is why they suggest it for LV and Dex VI. Still, Dex VI is the replacement for Dex III, and Dex III is basically Mercon, so it should work...I guess not in all cases though.
The US product data sheet lists Mercon V and Mercon specifically in the "suitable for" list, but with an "*except in California" note.https://sharena21.springcm.com/Publ...bd3/3fa3136a-09bd-e711-9c12-ac162d889bd1