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  1. #1
    New Member
    Join Date
    Feb 2012
    Lexington, Ala.
    Long 350

    Default Long 350 transmission oil

    I bought a reproduction manual for my Long 350. It says the transmission uses 20w40 API oil (17 qts.). Is this regular engine oil, and where can I find it? Can 15w40 be safely used (it is more readily available here), or is there a better substitute that I can use? Thanks for the help.

  2. #2
    Platinum Member
    Join Date
    Apr 2009
    Western Wyoming

    Default Re: Long 350 transmission oil

    You got my curiosity up, but I really couldn't find anything. I called Napa here and they do have 20w40 on hand. I guess it gets used in motorcycles that have one reservoir for the motor and the tranny. I read the same thing about using 15w40 in motorcycles also. So, I know that both are used in motorcycles, both are motor oils, and both are fine for wet disk transmissions. However, I haven't found anything saying that 15w40 can be used directly in the transmission. I personally don't think it will hurt anything, because the book is already calling for motor oil being used. To be on the safe side, ya might want to use 20w40 API. I hope you find a better answer!

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