GL-5 = BAD; Finding GL-4 gear oils can be a pain

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  • #31
    Nissan MTF is the best for cold and recommended for most Nissan M/T , Not great for hard driving as it is pretty thin
    Redline MT-90 good lube but a little thick on cold shifts
    Redline MT-85 We have used this with good success in the newer RWD 6 Speeds, Can be used in older nissan trans also and will help with cold shifts over the MT-90
    Motul Gear 300, 100% ester based synthetic gear lube, One of our favorites, Good cold viscosity (shifts easy cold) Will not harm Brass (yellow) metals, syncros ect. Very high hot film strength to protect gears under abusive use, Expensive but worth it to save your trans, Esp drag racing wear gear loads are very high.

    We stock all these if anyone needs them, Ohio, KY, IL, IN and surrounded states are usually 1 day ship time.
  • #32
    My local performance shop had Redline MT-90 in stock and tons of it.
    3 qts was roughly $45.

    So people should check their local performance shops. Just a FYI
  • #33
    Gregmatic wrote: I would stay away from anyhting that is marked GL-4 and GL-5. As said earlier, it is more like a GL-5 with a secondary GL-4 rating and will most certainly harm your synchros. Strictly GL-4.
    How long until the symptoms are noticed? Grinding?

    I put Coastal Gl-4 / Gl-5 last time because there wasn't anything else at the store. I haven't noticed any grinding yet or anything unusual. But then again, I don't drive the Z much.

    Damn, what a headache it'll be to find another transmission now :-?
    vg33et
  • #34
    [quote]solost wrote:
    Originally posted by Gregmatic
    I would stay away from anyhting that is marked GL-4 and GL-5. As said earlier, it is more like a GL-5 with a secondary GL-4 rating and will most certainly harm your synchros. Strictly GL-4.How long until the symptoms are noticed? Grinding?

    I put Coastal Gl-4 / Gl-5 last time because there wasn't anything else at the store. I haven't noticed any grinding yet or anything unusual. But then again, I don't drive the Z much.

    Damn, what a headache it'll be to find another transmission now :-?
    In my built 89 turbo, I use Royal Purple 75w90 which is advertises as gl4/gl5. I have ran this so far for 2 years or so without problems. My z31 currently has 548rwhp and with all that input going through the transmission, no problems, shifts great.

    But honestly, I would still recommend the GL4.
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