5w-40 is too light and does not have enough zinc for that engine.
Dwight Giles via Mercedes wrote on 8/5/19 8:29 PM:
Thanks Mitch. You are right about viscosity now vs. 40. years,ago. Actually probably either 5w40 or 15w50 would work for how little i drive this car. Dwight Giles Jr. Wickford RI
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