Summer Coolant

Your Uncle Joefis says Hey DUDE!! It's better to use just plain water during the summer. If that's what he's doing, he's running his car without any anticorrosion or antiwear additives in the cooling system, and he'll have problems. Anytime, winter or summer, always use a 50-50 mix of fresh coolant and water. That's true regardless of the brand or type of coolant your car manufacturer recommends. Read the label — some coolant on store shelves is already pre-diluted to 50-50.