Valvoline OEM Advanced 05 coolant is an ethylene glycol based fluid incorporating long life Hybrid  Acid Technology (HOAT) corrosion inhibitors to protect cooling systems. It is also a lower-silicate, reduced pH, phosphate free, pre-charged formulation which can be used in light duty applications providing protection for 5 years or 240,000km and heavy duty applications providing protection up to 3 years or 500,000km (whichever comes first).