While you guys are contemplating your manual transmission fluid replacement, you should also consider a magnetic drain plugs. I change my fluid about every 2 months as I track my car. My cue is when I start to hunt for the the shifts at the track because they become notchier. Every time, I find a very fine dusting of metallic dust on the tip of the magnet when I drain the fluid.
I went with the Dimple magnetic engine oil and transmission oil drain plugs. drainplugmagnets.com A little bit pricey but they are quality parts. A couple of spare O rings are bundled with the plugs too.
Ive been using Redline D4 ATF fluid for the last two fluid repalcements, but tried Valvoline MaxLife Dex/Merc ATF this time. I did this last night, and shifts are noticeably smoother again, even with the 2 months old Redline D4 fluid getting replaced.
My conclusion is that the Redline D4 fluid loses its properties pretty quickly when abused at the track. I track my car almost every week.
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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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