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Differential and Transmission Oil

This is a discussion on Differential and Transmission Oil within the X2/X4 Transmission & Drivetrain forums, part of the Yamaha Wolverine X2 & X4 847cc SxS category; All right, our differentials and transmission call for a friction modified oil due to the wet brake system. The book calls for. SAE 80 API ...

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Thread: Differential and Transmission Oil

  1. #1
    Moon Shiner 19Wherry's Avatar
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    Differential and Transmission Oil

    All right, our differentials and transmission call for a friction modified oil due to the wet brake system. The book calls for. SAE 80 API GL-4 hypoid gear oil. I was looking for a synthetic alternative. Contacted Amsoil today because that is my preference. I’ve used there oils with good results. They said all the newer side by sides with friction modifiers need to use their synthetic tractor transmission oil.

    https://www.amsoil.com/shop/by-produ...w-30/?code=Ath

    I asked about it being 5w30 and the gear oil is 80 weight. He said not to worry that it’s heat rating and weight exceeds the 80 weight requirements of the gear oil and that it was different between the to how that is rated. Is there any oil experts out there as I’m confused. They are experts and that is what they recommended.
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    Moon Shiner 19Wherry's Avatar
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    I got this response from them
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    Super Moderator MassiveOverkill's Avatar
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    We don't have a wet brake system. We have a wet clutch system that shares lubrication with the engine, but our transmission and rear diff don't have any need for friction modifiers that I know of. The front diff could possibly require it but Mobil 1 75W90 already has LS additives.



    Polaris, which is who Amsoil is probably thinking of requires some super secret foo-foo formula in their trannies that can only be satisfied by Polaris or Amsoil specs.
    Last edited by MassiveOverkill; 04-12-2019 at 02:09 PM.
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    Hog Chaser
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    Massive would be correct in the foo foo po po fluid bs.
    The X2 book said 80/90 wt, trans and diffs. GL4 or GL5 would be fine.
    The only thing I add is about 25% of the Lucas oil treatment to those parts. It's a climbing gear lube and sticks to them, like a protective film.
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    It seems to work very well to. I used it in my previous machines tranny. Cause it had 2 chains in it, and the chains and gears went vertical. It helped a lot in that one.

    The biggest thing to do, keep water out and make sure the vent lines on the diffs are clear. Blow air thru them if you can. When those vent hoses get blocked, that's when you can blow a seal. Then the water gets in.
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    Moon Shiner 19Wherry's Avatar
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    Ok this all is making better sense. I was questioning why wet brakes was mentioned. And I do understand how the wet clutch and engine share oil. The Yama lube version of gear oil does have a friction modifier in it to my understanding. Is this just to keep chatter down or something.

    After reading more as you guys have said it probably just the front that needs the friction modifier due to the clutch plates for the limited slip when in 4 high. The friction modifiers is just a bonus for the trans and rear differential and to simplify things. I’m just assuming and going of your collective knowledge and a day of googling. Lol
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    Last edited by 19Wherry; 04-13-2019 at 07:03 AM.
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    Pavement Princess InfidelMT's Avatar
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    They don't have 2019 listed yet but doesn't matter the 2018 is the same.

    https://www.amsoil.com/lookup/utv/20...847/us-volume/
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