AMSOIL Propylene Glycol Antifreeze & Coolant eliminates the need for supplemental coolant additives (SCAs), extenders and recharging cooling systems. It provides extended service life in all gasoline and diesel vehicles, with recommended intervals of 150,000 miles or five years, whichever comes first, in passenger cars and light trucks and 1,000,000 miles,12,000 hours of operation or eight years, whichever comes first, in heavy-duty and off-road applications.