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Why do some motor oils carry the “API Certified – For Gasoline Engines” starburst symbol on the bottle while others do not?

April 26, 2017bottle carry motor Oils starburst symbol

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Why do some motor oils carry the “API Certified – For Gasoline Engines” starburst symbol on the bottle while others do not?

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Additive packages used in some motor oils such as high mileage motor oils can affect the ratings due to the American Petroleum Institute approving these standards. The oils will still meet the requirements for API Certification.