OAT coolant has additional additives and protectants that are meant to go around 10 years before being flushed.Īnd then, of course, there’s a combination of the two – called HOAT (hybrid organic acid technology). OAT coolant comes in many colors – the most common colors are orange or bright red, but OAT coolant can also come in blue and dark green. Newer engines, especially in vehicles from carmakers outside the U.S., have OAT (organic acid technology). If your engine has conventional antifreeze and it looks brown, it’s a sign that there’s corrosion in your radiator and it’s definitely time for a coolant flush to protect your engine. IAT coolant is a recognizable bright green and generally needs to be changed every 2 years/30,000 miles. The coolant you might be most familiar with, present in cars since WWII, is called IAT (inorganic acid technology). This is a surprisingly complicated question, because newer, modern engines have changed some of the rules.
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