Gear Oil for Airheads

Discussion in 'Airheads' started by Sox Fan, Apr 24, 2010.

  1. Sox Fan

    Sox Fan SoxFan

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    Curious what gear oil to use for my R90/6 for the transmission and final drive. I did a few searches and was surprised I didn't find much information.
    #1
  2. Joerg

    Joerg Long timer

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    RTFM? I mean, really, it's all written in the rider's manual ... :pope

    Factory specs are API GL5 (this is a "must have" since this means Hypoid oil), and a viscosity around SAE 80W-90. The brand does not matter as long as these specs are fulfilled.
    #2
  3. tennessee thumper

    tennessee thumper now in Mt. View, AR

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    Chopperman,

    Right on, that is hilariously funny and true.
    #3
  4. Sox Fan

    Sox Fan SoxFan

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    Believe it or not, my 34 year old motorcycle didn't come with an owner's manual. I also thought maybe some things may have changed over the past few decades. Thanks for the info just the same.
    #4
  5. crazydrummerdude

    crazydrummerdude Wacky Bongo Boy

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    Go to OReillys. Find 80w90. Put it in your beemer. Let people tell you how wrong/cheap you are. Repeat.
    #5
  6. Sox Fan

    Sox Fan SoxFan

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    LOL! I am one of those people who puts Castrol GTX from Wal Mart in my $20,000 RT so I am used to being called cheap and foolish.
    #6
  7. tennessee thumper

    tennessee thumper now in Mt. View, AR

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    From one drummer, just south of you in Mt. View, AR...to another, your take is tried and true. I can back it 100%!
    #7
  8. Joerg

    Joerg Long timer

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    Hi,
    100% along the same line: I usually buy my gear oil in a shop nearby that carries farm accessories (for the Swiss that are reading along: Landi) ... it's a standard gear oil for tractors.

    And yes, I get the same faces when comparing prices with the dedicated motorcycle shop :lol2 :thumb
    #8
  9. Yarddog

    Yarddog Been here awhile

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    I went to my local brick & mortar Beemer shop. I asked them what I should use. They told me. I bought it. I put it in. No problems. Redline 85-90w synthetic or something like that...
    #9
  10. Infracaninophile

    Infracaninophile Finding My Way..

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    I use 80/90 Synthetic but then add a dash of lemon and balsamic vinegar. It makes my hands smell nice while I'm changing it the next time. :lol3

    T.
    #10
  11. motoboyvfr

    motoboyvfr Guest

    Try cinnamon and nutmeg sometime...makes your hands smell like fancy french toast.
    #11
  12. Jasper ST4

    Jasper ST4 Guest

    I use Sta-Lub. It says Hypoid on it so that's what I used for 30+ years with no ill effects but it was GL4, the gears still look pristine (170,000 miles later). I bought the GL5 version this time around though so I'm expecting a few extra horses to make it to the wheel.
    #12
  13. Overdog

    Overdog 'Burghherfer.....

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    .....I dunno... I'd be really careful there. I put 80/90 in my airhead and a year later, the diode board went bad.
    #13
  14. Pink Floyd

    Pink Floyd Air Head

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    Red Line Shockproof Heavy

    This stuff pours out like a strawberry milkshake. It is amazing how it coats and clings to the gears. It's expensive, but it's good oil and you only need a couple quarts to do the trans and final drive on an airhead so I think it's worth the price.
    #14
  15. Sox Fan

    Sox Fan SoxFan

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    Anyone know the meaning of the term "hypoid"? Found some 80w90 GL5 API gear oil at the local auto parts store.

    Changed the transmission, final drive and driveshaft oil. Holy crap is the final drive easier to change on an airhead than a modern BMW.
    #15
  16. BMW Kurt

    BMW Kurt Bluesman

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    Castrol 80W-90 dino.
    #16
  17. crazydrummerdude

    crazydrummerdude Wacky Bongo Boy

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    Shit.




    :lol3
    #17
  18. jtwind

    jtwind Wisconsin Airhead

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    Madison WI
    ditto, I've been using the redline lately and the bike seems to shift smoother. Pretty amazing stuff.
    #18
  19. Joerg

    Joerg Long timer

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    Hi,
    It refers to the shape of the teeth in the final drive. Citing Wikipedia: "Special gear oils are required for hypoid gears because the sliding action requires effective lubrication under extreme pressure between the teeth."

    ... and from the related Wikipedia article on gear oils:

    "API GL-4, oils for various conditions - light to heavy. {...}
    API GL-5, oils for severe conditions. {...}"
    That fits. API GL5 is Hypoid oil.
    #19
  20. Havingfun

    Havingfun the road less traveled...

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    All the above. :evil
    #20