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Why did API change the formula in engine oil?

April 26, 2017API engine Formula Oil

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Why did API change the formula in engine oil?

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Experts say that there are numerous reasons, but one of the main reasons is that the American Petroleum Institute (API) has regulated the amount of zinc downwards – from .15 to .08 percent – due to its supposed harmful effects on catalytic converters and emissions systems. The change was aimed at extending the life of catalytic converter-equipped cars, not older models or racing engines.