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Thread: Chief Transmission and Primary Oil

  1. #1
    Join Date
    Sep 2010
    Location
    CT
    Posts
    16

    Default Chief Transmission and Primary Oil

    Hi everyone I was just doing my spring service work on my 39 Chief and was wondering what oil everyone uses in their Chief Trans/Primary cases. Thanks for any and all replies. Hope everyone is making good use of the recent good weather.

  2. #2
    Join Date
    Jun 2007
    Location
    Catonsville,Md.
    Posts
    136

    Default

    I've used straight 30 weight non-detergent and 20w-50 sport transmission oil synthetic that is made to use with clutch and noticed no difference .

  3. #3
    Join Date
    Jan 2016
    Posts
    121

    Default

    I am using straight 50 weight in the trans and primary, I live in Central Florida.

  4. #4
    Join Date
    Jul 2010
    Location
    Vermont
    Posts
    533

    Default

    30W non-detergent here (gearbox and primary connected)
    Pisten Bulley is Harry Roberts in Vermont.

  5. #5

    Default

    Harley Davidson Formula Plus. Made for primaries and wet clutches.

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