Hybrid Organic Acid Technology (HOAT) is a combination of IAT and OAT with nitrites added. The generally recommend replacement interval is five years or 150,000 miles. In addition to its use in 1996 model year and newer GM cars and trucks, OAT also is used in 1996 to 2001 Audi, Land Rover, Nissan, Mazda, Toyota, Honda, Kia, VW, Jaguar, Saab and Porsche vehicles. Green, pink and blue have been added to the list of available OAT antifreezes. Its first dye colors were the orange and red color still used by General Motors. OAT antifreeze was widely used in Europe before its introduction in North America. Organic Acid Technology (OAT) was the first long life coolant (LLC)/extended life coolant (ELC) introduced in North America and was commonly known in GM parlance as Dex-Cool. The generally recommend replacement interval is three years or 36,000 miles. IAT can be used with either EG or PG and is most always fortified with silicate or phosphate additives that make it compatible with various metal cooling system components. Inorganic Acid Technology (IAT) is the chemical composition for the traditional green antifreeze. The easy part is that most antifreeze is still made with ethylene glycol (EG), a type of alcohol made from ethane, while some environmentally friendly versions are made with non-toxic propylene glycol (PG), a similar compound made from propane. Today, with four types of antifreeze technology and a rainbow of sometimes conflicting colors, there is a lot of confusion among automotive people and consumers alike as to what color antifreeze is best for each vehicle. Simply change the antifreeze at the prescribed service interval and life was simple. As the engine operated, the antifreeze would perform its primary duties of carrying heat to the radiator, preventing freezing (hence the name) and protecting against corrosion in the cooling system. You mixed the antifreeze 50/50 with water and poured it in the radiator. Remember the old days when antifreeze was antifreeze? No matter which brand you chose, the color was green and the formula was glycol-based and contained silicates as corrosion inhibitors. underhood antifreeze coolant repair shop training technician training automotive aftermarket Picking the right color antifreeze will help you in your daily work.
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