Use only when specified. Approved to Ford Specification WSS-M97B57-A1. Use when Ford Specification WSS-M97B57-A1 is specified. A 50/50 mixture of this antifreeze/coolant and distilled water provides year-round freeze protection down to -34 °F (-36.7 °C) and boiling protection up to 265 °F (129 °C).
