Quote:
Originally Posted by Xstar
Redline specs their 75W GL-4 for BMW F15 transfer case fluid.
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Have had this fluid in my F15 for about a year with no clutch wear according to the ISTA+ calibration procedure (offset angles remained the same).
That said, it's clear from a UOA that the BMW transfer case fluid (TF-0870) is
very different than MT-LV. The Redline fluid will undoubtedly reduce metal component wear compared to OEM fluid, but it is also possible the high anti-wear additive content could interfere with proper clutch operation or cause glazing (permanent damage).
Motul lists their DCTF as compatible- which in theory is closer to the transfer case in design than the manual transmissions Redline MT-LV was designed for. Ravenol also makes a true synthetic TF-0870 specifically for transfer case use.
In my next drain and fill I've decided to go with the Ravenol fluid due to the above concerns about clutch compatibility.