You might want to download and read through the BMW Motorsport racing parts catalogs from the BMWNA website. For the racecars BMW Motorsports builds, the fluid lineup is as follows:
Engine oil - TWS
Transmission oil - MTF-LT2
Differential oil - SAF-XJ
Brake fluid - Castrol SRF
With the exception of the brake fluid, it's the same stuff as in your M car. To suggest it's not good quality or that products from another company are better is easier to say than it is to prove. Maybe Redline or Motul make better fluids, and maybe they don't. Personally, I'd go with Motorsports' judgment on the matter.
Quote:
Originally Posted by elp_jc
Good thread man. I'm going to use non-BMW fluids when I change both diff and tranny oil in a few months. Not only do I believe what BMW charges is absolutely ridiculous ($50 for a freaking pint), but also that they're not the best around. And at 8K miles (max) every 2 years when I do it, anything would hold, let alone top-shelf fully synthetic fluids. However, I'll keep using TWS motor oil, at least during warranty. I don't believe it's needed the way I drive the car, plus several months of near-freezing weather in winter (too damn thick), but with many engines with bearing problems and other internal maladies (broken springs, VANOS problems, etc), I rather play it safe, although it's very possible that bearing problems are deriving from that too thick TWS that doesn't start lubricating properly several minutes after a cold start. Oh well.
So let's hear it gang. Please list what specific fluids you're using, if at all. I'd like to know which of the best known brands (Redline, Amsoil, M1, Royal Purple) is best for our tranny and diff, and what specific p/n. And I want a diff fluid with FM already in it. Best wishes for the new year to every forum member, especially health.
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