Engine Oils Api Service Categories
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The API motor guide can be found online, and indicates which API Service Categories of engine oil are current, and which are obsolete. We recommend using oils that meet or exceed API certification standards, as these oils will likely have a better additive package. The letter "S" in the API rating indicates a "service" rating for automotive gasoline engines. The letter "C" indicates a "commercial" rating for diesel engines. View Related Article
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