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FA-4

FA-4 motor oils may be the best thing ever to happen to diesel engines, but not all fleets are yet reaping the benefits.

The American Petroleum Institute's new diesel engine oil-service categories, API CK-4 and FA-4, will begin appearing in the marketplace on Dec. 1.

New motor oils are coming to truck engines and lubricant marketers near you this December; here's what you need to know.