SG

An API designation for oil used in gasoline engines in 1989-92 passenger cars, vans, and light trucks. Category SG oils also include the performance properties of API Service Category CC. (Certain manufacturers of gasoline engines require oils that also meet the higher diesel engine Category CD.) Oils developed for this service SG provide improved control of engine deposits, oil oxidation, and engine wear relative to oils developed for previous categories. These oils also provide protection against rust and corrosion. It replaces SF class oil and was replaced by SH classified oil. These vehicles can benefit from the modern SM oils.

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