During extensive fleet testing, the synergistic combination of mono- and di-carboxylates present in this coolant, have proven to provide protection for in excess of 650,000 km (approx. 8,000 hours) in HGV and bus applications, 250,000 km (approx. 2,000 hours) for cars or 32,000 hours (or 6 years) for stationary engines.The main corrosion inhibitors in Havoline Xtended Life Antifreeze/Coolant have been shown to remain above 95% of their original concentration with proper top off after 250,000 kilometers in automobiles. This allows much longer intervals between coolant change-outs.

Havoline Xtended Life Antifreeze/Coolant is based on a patented aliphatic organic additive formulation that provides a service life of 250,000 kilometers/5 years and is approved under GM 6277 meeting the GM DEX-COOL® requirements.a>