I have been told that oil with any oil with "40" is the same deal. In fact, a noted YBlock engine builder uses Valvoline conventional 10-30 and 10-40 in all his engine builds as they have enough zinc.
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Originally Posted by tubman
Just for information's sake, any oil with "50" as the last number of the weight has sufficient zinc for just about any need. For that reason, I run Mobil-1 10/50 in the hemi in my race car with an Engle roller cam.
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