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Is 15w-40 API SG/CF a synthetic oil?

April 26, 2017API cars CF maintenance repairs SG synthetic Transportation

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Is 15w-40 API SG/CF a synthetic oil?

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15W-40 is a standard weight / viscosity for diesel engine oil. It is available in both conventional and synthetic formulations, most of which will meet or exceed the API specifications for your engine. And YES, synthetic diesel engine oils do exist and are readily available.