Should I stop using dex cool antifreeze?
NO! DexCool was specifically designed for your modern engine. It has a different protection package for your engine and cooling system. The green antifreeze is the old ethylene glycol based coolant designed for older engines. Do not mix the 2 coolants as they are very different. The Dex Cool is an Organic Acid Technology based coolant, while the old green coolant is not. The problem is not with the coolant, rather it is with the poor design of the gaskets and materials that they are made with. GM and other aftermarket companies have come out with redesigned gaskets that work fine with the Dex Cool. Other instances that are wrongly blamed on Dex Cool is poor maintenance and air infiltration into the cooling system. Service your Dex Cool every 3 years or 40,000 to 50,000 miles instead of the old recommendation of 5 years/150,000 miles, and check your radiator cap to make sure the seal has not failed, letting air in the cooling system.
