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Originally Posted by JHZR2
What is specified for your vehicle?
I ran Pentoson FFL-3, IIRC, because it crossed to he ZF spec that crossed to the BMW MTL spec for my 135. Ive been happy.
Lower viscosity lubricants will perform better in the cold but compromise high temperature performance to a point. Higher viscosity will be more difficult to shift in some conditions. Some fluids may have friction modifiers that affect synchronization.
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I have the GM 6spd transmission
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I would use Redline oils. Either
Redline ATF-D4 or
MTL. The ATF-D4 flows better at colder temps(If you park your car outdoors). Even though it's an ATF... its safe to run in your manual trans. You can also look on Redline's own website for suggested fluids. I think they will say to use
ATF-D6 or
MTL. But I prefer AFT-D4 for my 135i 6 speed manual. You will need a little over 2.1 liters of trans oil
For the diff you can use either a 75w140 or a 75w90 gear oil from Redline. You will need some way to suck out the old diff fluid - with a fluid extractor. You will need a little over 1.1 liters of diff oil.
Dackel