20 GEARHEAD ANSWERS

摘要

What oil do i need and what do those ratings mean? There are several ratings assigned to motor oils by the American Petroleum Institute (API). The newest ratings (SM and SN) always supplant older ones and are backward-compatible for engines, meaning they're approved for use in anything that was covered by the previous generation of oils. If your engine uses a roller cam, no sweat, you're fine with the modern oil of your preference.