Originally Posted by kaiv
I'm gonna guess track time does that. The fluid sees high temps there and breaks down faster. Which is why I change all this stuff much sooner than BMW's recommended intervals.
Transmission always felt great although it does feel a little smoother since
And I thought my fluid was dark... got nothing compared to yours. But mine did shift a bit easier. Always had issues going from 4th into 5th, and fresh fluid definitely helped.
Really simple DIY btw, definitely worth doing.