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What does the API donut on the back of the label stand for?

April 26, 2017API donut Label stand

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What does the API donut on the back of the label stand for?

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The API Donut is the official motor oil license symbol of the American Petroleum Institute. It can only be used on motor oil containers when the fluid inside the container is registered with API. The ‘donut’ will have the API Service Classification for the oil clearly stated inside it.