Base on item description i guess the new green Zerex is fl22 compatible and I can just top off using it : "Coolant/Antifreeze; 50/50 Mix; ZEREX Asian Vehicle Antifreeze/Coolant is specifically formulated to meet the requirements of Asian vehicle manufacturers (Toyota, Lexus, Scion and others) requiring a green, silicate free Hybrid Organic Acid Technology (HOAT) with a phosphate additive. This patented formula is designed to replace the original fluid and provides protection from rust, corrosion, boil overs and freezing. > Formulated to replace the OEM fluid in Asian make vehicles such as Hyundai, KIA, Mazda, Mitsubishi and others requiring a green, silicate free HOAT antifreeze/coolant "