The AP Racing AP551 brake fluid has been re-branded as Radi-CAL™ R1 - Silver Bottle with Black cap. The AP Racing R1 brake fluid can be used for either competition or road use. APR1 fluid is suitable for all forms of motorsport and conforms to FMVSS 116 DOT3 specification. This brake fluid is magnesium compatible but has a higher boiling point than normal brake fluids intended for road use.
AP Racing APR1 has a dry boiling point of 269°C and a wet boiling point of 140°C.