Duralec Super motor oil is specifically formulated to maximize component life extend drain intervals and improve fuel performance with excellent high temperature break down resistance and low temperature pumpability to minimize cold-induced startup wear.
Royal Purple Duralec Super 15W40 Synthetic Motor Oil 3-Gallon Set. Royal Purple Duralec Super 15W40 synthetic motor oil provides superior lubrication and engine protection for heavy-duty diesel engines.
