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  1. 04-30-2020 09:26 AM #11
    Westfield 11
    Westfield 11 is offline Senior Member
    Join Date
    Jul 2007
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    1,001

    Re: Geny Oil Viscosity?

    NAPA brand 15w40, in both generators, the Yamaha 60hp outboard and the 125cc scooter. This really simplifies logistics as I only have two oils onboard and they are in five gallon pails with hand pumps.
    Michael & Beth
    Hull Number CV312
    63’ Cockpit Motor Yacht
    1986 model launched in August 1987
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  2. 05-03-2020 09:15 PM #12
    spartonboat1
    spartonboat1 is offline Senior Member
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    Apr 2005
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    Re: Geny Oil Viscosity?

    Quote Originally Posted by Boatsb View Post
    Check it calls for a higher zinc. I use valvoline blue premium 15w40 on my cummins engines.
    The Zinc is also termed "ZDDP" and is present is larger values in the Shell Rotella T6 (synthetic) I run in my MB Diesel car. I forget if the other grades of the Rotella have higher ZDDP. I know that Classic Car people recommend oils with higher ZDDP for better bearing, etc. protection.
    50 Years on the Great Lakes...
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