Motorcraft VC8 Diesel engine coolant additive - 1 Pint(473 ml) In all heavy-duty, diesel engine cooling systems equipped with green-colored Motorcraft Premium Engine Coolant meeting Ford Specification ESE-M97B44-A In all heavy-duty, diesel engine cooling systems equipped with yellow-colored Motorcraft Premium Gold Engine Coolant meeting Ford Specification WSS-M97B51-A1 Designed to replace additives depleted between coolant change-outs Now dyed yellow to eliminate engine coolant color change when mixing