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6AT ATF Flush?
Does anyone else here have a 6AT 135i and/or have any experience with servicing the transmission?
I'm at almost 100,000km and since going to the track day in September I've noticed that the tranny is really not very smooth...
I've done a bit of research into fluids flushes and services but the main question I have is which fluid should I go with when I get it serviced or flushed?
I know that we use either Shell M1375.4 or ZF Lifeguard 6 and people have used Redline D4. I've also read somewhere that someone used Castrol Transmax Z.
Are Redline and Castrol suitable alternatives and of the 4 options, which would be the most suitable if I'm tracking the car?
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