Zinc oil additives

Mobil1 FS 0W-40 is a fully formulated oil, so no mixing needed. It has 1000 ppm ZDDP. It meets all the high zoot Porsche, VW, and Mercedes Euro specs, which are more demanding than the American and Asian standards. Five quarts for around $25 at Wally World. The head guy at HPL says it's the best bargain out there.