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Originally Posted by TheRuss
....At this point, I have no idea what to go for.
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Everything you posted above is true. I never heard of mixing ATF D4 and MTF. I would only use one or the other.
You might ask the guys on Bob the oil guy - forum. Here is an interesting thread...
http://www.bobistheoilguy.com/forums...Number=1643610
Quote:
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I'm pretty sure at this point that the Redline 75W-90 fluid will go in my diff though, as that seems to be a bit of a no-brainer, but does anybody have any advice or anything to add that would help with my choice of transmission fluid? It seems that even the "pros" that know about this stuff can't agree, so I'm left utterly confused. Also, is my gearbox likely to be MTF1, 2, or 3? I presume 3, as per Redline's statement?
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Yes, for your diff fluid you could use: Redline 75W-90 GL5 gear oil. In fact I run this in my older BMW, an e39 535iA V8 with no issues.
You have to also realize that BMW specs two different fluids for the manual trans one for the
N54 and one for the
N55 powered cars.
What year is your car? Its a 135i right>>
BMW specs...
N54 manual trans
MTF-LT-3 fluid. (trans holds slightly more than 2L)
N55 manual trans
MTF-LT-5 fluid. (trans holds slightly LESS than 2L)
Two years ago when I first changed my N54 manual trans fluid... my German dealer over here looked up the fluid specs. They told me that MTF-LT-3 is specified, but that BMW now makes a MTF-LT-4 fluid. So that is what I ordered and used. The shift effort was better, but not great. About a year later I switched to
Redline ATF-D4 and was very happy with the results.
I have been running the D4 fluid for almost two years now. I am getting ready to change it again. I will use D4 again with Redline 75W-90 GL5 in my diff.
Hope this helps you out in your decision.
Dackel
Other interesting threads...
use a pump like this to remove your old diff fluid.
http://www.1addicts.com/forums/showp...&postcount=113
What my old trans fluid looked like...
http://www.1addicts.com/forums/showp...2&postcount=91
My DIY for changing the trans and diff fluids...
http://www.1addicts.com/forums/showp...0&postcount=70