Use only when specified
- In all diesel engine cooling systems equipped with fluorescent green-colored Motorcraft® Premium Antifreeze/Coolant meeting Ford Specification ESE-M97B44-A
- In all diesel engine cooling systems equipped with yellow-colored Motorcraft® Gold Antifreeze/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