What is the difference between “light duty” antifreeze and “heavy duty” antifreeze?
“Light duty” antifreeze is intended primarily for gasoline-engine passenger car applications. “Heavy duty” antifreeze is intended for diesel engines in both on- and off-highway applications. Diesel engines in heavy-duty truck and construction equipment have more severe corrosion prevention requirements than gasoline-engines in passenger cars and therefore require more corrosion inhibitors. Using “light duty” antifreeze in an over-the-road tractor will cause cooling system problems unless an SCA in proper amount is added to the antifreeze.
