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This Guidelines to help you to choose which engine oil to use.

• Refer to your owner’s manual for type of oil to use.

• Follow manufacturer’s oil change recommendations.
  

• Use only the recommended API category: “S” for gasoline engines; “C” for diesel engines.

• Select the proper SAE oil viscosity grade.

• If you find it necessary to mix brands of oil, use the same viscosity grade and API service category to maintain performance.

API’sServiceSymbol andCertification Mark identify quality engine oils for gasoline- and diesel-powered vehicles. Oils displaying thes marks meet performance requirements set by U.S. and international vehicle and engine manufacturers and the lubricant industry. More than 500 companies worldwide participate in this voluntary program, which is backed by a marketplace sampling and testing program.

Which SAE you should we choose:





For automotive gasoline engines, the latest engine oil service category includes the performance properties of each earlier category. If an automotive owner’s manual calls for an API SJ or SL oil, an API SM oil will provide full protection. For diesel engines, the latest category usually – but not always – includes the performance properties of an earlier category.


SAE Detail : Gasoline Engine Diesel Engine *click to Enlarge










source: http://en.wikipedia.org/wiki/American_Petroleum_Institute