Best oil for My Slant 6

Rug_Trucker said

15-40 Valvoline diesel was what I was running in my 198. High detergent, plenty-0-zinc.

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Diesel oil is not really a good oil for gasoline engines. Additive package is not correct. A stock slant six engine in "normally" serviceable condition, needs noting other than a reasonable quality 10w-30 conventional oil.