Sunoco Super C Gold SAE 10W-30 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. SUNOCO SUPER C GOLD 10W-30 CK-4 can be used with complete success in extreme applications involving any vehicle or diesel engine where an API CK-4 or earlier C class oil is specified and a fuel economy savings over a 15W-40 viscosity is desired. Field studies have shown a 1% or more fuel savings by switching from a 15W-40 to a 10W-30 engine oil.

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