Car oil differences
Premium Conventional Oil: This is the standard new-car oil. All leading brands have one for service level SL, available in several viscosities. All leading brands have one for service level SL Motor oil helps lubricate an engine to reduce friction and maintain smooth movement of working parts, thereby increasing performance. There are three main types of motor oil: conventional, synthetic, and synthetic blend, the last of which combines some of the properties of the first two.