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I like the D4-ATF so far in my 6-speed manual 2011 135i. Helps with smoother shifting while driving on the street, and at the track. The only problem I have is its longevity. When abused at the track on a weekly basis, after 2 months, shifting becomes notchy again, leading to missed shifts.
Ive changed twice in the last 4 months, and changing it again today before hitting a renowned high speed track LCMT (Le Circuit Mont Tremblant).
The transmission is also noisier with the D4-ATF.
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2011 X3 35i with M pack + 2011 135i w/6SPMT | 255 square tire setup | Quaife 3.46 LSD | Diff lock down bracket | Bilstein B8+Swift SpecR springs+H&R FSB | CDV delete | BMS Oil Tstat bypass | ER FMIC & CP | N54Tuning DP | GC Street Camber Plates | M3 FCA +guide rods+RSFB's+Tranny mounts | Manzo toe arms | Cobb Stg2 agressive tune | Hawk DTC70 brake pads | RB SS brake pistons | Goodridge SS brake lines | Custom brake cooling ducts
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