Sunoco Super C Gold SAE 15W-40 is a premium synthetic blend diesel engine oil that exceed the latest API CK-4 diesel specifications as well as the warranty requirements of most manufacturers of diesel engines. Designed for use in model year 2017 and newer heavy-duty diesel engines in high output service, as well as being fully backwards compatible to engines requiring any API C service class, SUNOCO SUPER C GOLD 15W-40 CK-4 provides robust protection, increased oxidation stability and excellent shear stability over any previous API category.

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