15w40 Shell Rotella. Liberty do you not have a diesel genny ?
Hood Hi Goalie, my above comments are regarding the gas 5e that I had in my previous boat, 342 FV. Yes, my current boat is a diesel Koehler genny like yours and I use the same 15w40 in that genny that I use in my mains.
Good oil but very hard to find. I bought two five gallon pails early in the spring when it was still available for the fall winterization . But now it is all back ordered.
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