CITGARD 600 HEAVY DUTY ENGINE OIL 15W40 4/1Gallon CASECITGO CITGARD 600 Engine Oils Multi Viscosity Grade use superior technology to protect current and older model low emissions engines equipped with exhaust after treatment systems and other new design features. These products exceed the API CJ 4 heavy duty requirements as well as existing API CI 4 PLUS and earlier categories. Recommended for use in heavy duty service in commercial trucks, agricultural equipment, construction equipment, stationary