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Thread: Front fork oil for R75/5?

  1. #1
    Registered User 10drum's Avatar
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    Front fork oil for R75/5?

    I live in a small town, I checked everywhere for fork oil that is listed in the Haynes manual. I use 10w-30 in my old British bikes. Any suggestions?

  2. #2
    Liaison 20774's Avatar
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    I think 10w30 engine oil is going to be too stiff. You want something that has around 7 to 10w in a fork oil blend. Seems like you could find other motorcycle shops with something that would work. There's also Amazon. Here's a page that Snowbum has on oils and viscosities:

    http://bmwmotorcycletech.info/viscosity.htm
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Back when the /5 was a new model the fork oil used was 3 wt. Some of us found it too thin and went to 5 wt. Later BMW came out with 7.5 wt in BMW branded oil. I would not go heavier than this in a /5. I would go to any decent motorcycle shop and get 5wt fork oil. Bel Ray, Yamaha branded, Kawasaki branded, Honda branded and others are available.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  4. #4
    #4869 DennisDarrow's Avatar
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    Amazon:

    https://www.amazon.com/Maxima-54901-...s=5wt+fork+oil


    Probably 20 different selections, 2 day delivery

  5. #5
    Registered User 10drum's Avatar
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    Thanks for the replies.

  6. #6
    Nick Kennedy
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    What weight is ATF fluid?

  7. #7
    Liaison 20774's Avatar
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    Snowbum has a couple of values for brands of ATF here:

    http://bmwmotorcycletech.info/front-...ls-amounts.htm

    In a table at the bottom of the page.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  8. #8
    I just went through my front forks and used Maxima 10wt fork oil. It seems to be fine. For the age of this bike, it really "drives" and handles well.

  9. #9
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    I did a complete rebuild on mine and started with 5w, but found it a bit soft, so i switched to 10w and found a good balance between ride and damping. 160 lb rider by the way. Cheers.

  10. #10
    Nick Kennedy
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    I use Pennzoil ATF fluid in both my 1978 R 80 with a Luftmeister fairing and my 1990 K75 RT
    Seems to work just fine by me, those other choices are too expensive IMHO
    Some of that stuff is so expensive, its outrageous, I can't believe they can sell it at some of those prices.

  11. #11
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    fork iol

    I have used ATF in motorcycles for years it is more refined than fork oil

  12. #12
    Quote Originally Posted by galaxie View Post
    I have used ATF in motorcycles for years it is more refined than fork oil
    Usually about 2.5 to 3 wt. Specified in the /5 but not since. Later specifications have been either 5wt or 7.5 wt. mostly.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  13. #13
    Nick Kennedy
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    HMMMM
    Maybe that's why my bikes seem to ride Sooo smooth?
    ATF it's not just for breakfast anymore!

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