Posi Differential fluid 65 Rivera

Discussion in 'Got gears?' started by jeffrro1, Sep 14, 2021.

  1. jeffrro1

    jeffrro1 Member

    I could use a little advice. I am working on a 65 Rivera with a posi rear end and I would like service it and don’t want to cause an issue with using the wrong oil. Factory manual states to use Buick 723 equivalent oil. That design really cross reference anymore. I have tried to do some research some say to use synthetic, some synthetic with the additive, others recommend non synthetic with additive. . Just don’t want to cause an issue using the wrong fluid.

    Thanks for the help.
  2. Mark Demko

    Mark Demko Well-Known Member

    Any non synthetic with posi additive should be fine
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

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