Just changed fluid and filter this weekend - Put in close to 6 quarts of Valvoline Dexron 6.
Tranny didn't implode, explode, or go up in smoke. To the best of my knowledge, shifts just as it did before.
Personally, I didn't notice any viscosity differences between original (used) fluid (Texaco spec'd), and Dex6.
Original fluid came out looking like dirty motor oil. Perhaps not quite as black.
87,000 miles, 05 325xi.
Last edited by yo_marc; 10-08-2012 at 09:45 AM.