Zinc additive

Been using the Lucas stuff. Ignore the directions that say to use a full bottle. I think SlantsixDan on here did the math, and it only takes a few spoonfuls to equal the Zinc levels of the old oils. I have also been running 15-40 Diesel oil, as it has a higher Zinc level, is normally cheaper, and 2 of the gallon jugs fits nicely in my 8 qt. pan.