Transfer Case still works well !
Pushing 35K miles on synthetic ATF in TC with about 450+ bph of E85/methanol and finally changed out clutch this past week.
Took out tranny (picture attached). Decided to change out all fluids. Transfer case fluid looked like the day I put it in, no metal, no debris, no black stuff, no burnt smell, nothing, just nice looking red fluid. Refilled with Mobile 1 synthetic ATF, again. Will take a look in another year or two after another 30k miles.
I didn't have to reset anything? AWD light went off after a few miles.
I may be a "risk" taker, make decent money so I'm not trying to save $50 for special TC fluid, just noticed a lot of XI's have used synthetic ATF/and blends back in the early 2000's. Not saying the E90 is the same Xi TC as an E46, and that I don't suggest anyone else do this so don't be hating me.
I also was a "risk" taker with my E46 M3 and use to blend various ATF and MTF in my 6 speed to help eliminate clutch chatter....had about 120,000 miles on that car with the original clutch.
Look at the size of this transmission/TC.....impressive! I put a little MTL with my ATF in the tranny too!!!
The E90 is getting up in age so there are used TC out there for $300-$500 if I ever need one. Would take about 2 hours to get one in and out, no big deal.
p.s. My rear differential fluid at 120,000 miles was nice and clean, very viscose.
2008 335xi - 6MT - BMS JB4 G5i - BMS DCI - BMS OCC - BMS WW Meth - Spec Stage 2+ - Spec SMFW - 19" MVR Magnum's - KW V1's - TMS 12.5+20mm Spacers