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Best oil for manual tranny in 1985 M635 Euro

Discussion in 'E24 (1977-1989)' started by rmorin49, Oct 18, 2013.

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    rmorin49

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    I have a 1985 M635 Euro with a 5 speed manual tranny. I live in western MD and it gets quite cold in the winter. I have noticed the tranny is a bit notchy and difficult to shift when cold. What is the best gear oil to use? I would like to use the same oil year round. I have heard that Redline MTL and Brad Penn are 2 good choices. What is the best weight? Would 80W-90 GL-4 be OK?
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    • Technical Service Advisor

    charlson89

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    I highly recommend Redline for this great fluid.
    • Member

    rmorin49

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    charlson89: I called Redline customer service and they said that depending on the label on my tranny, the recommended Redline product would differ:
    Green label: MTL 90W
    Red label: ATF
    No label: MTL 80W90

    Can you assist in determining correct choice. I was leaning toward the 70W80 in an effort to make the shifting smoother at cold temps.
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    Satch SoSoCalifortified

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    I would think ATF is a mite thin... I use MTL (what's that, 75? 80? 90?), but it isn't cold here. I'd recommend MTL 80W90, but it's probably worth a phone call to the Coupe Doctor, Carl Nelson: 800 466-8184.
    • Member

    rmorin49

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    I checked my owners manual and it says use 80W gear oil so I am going to go with Redline 70W80 MTL.

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