HOAT=Red Pink Yellow or Blue Nice to know Said to use the very best aspects of both IAT and OAT, HOAT is a very protective, long-life coolant. HOAT (Many colors) Hybrid Organic Acid Technology (HOAT) is found in newer Ford, Chrysler and Mercedes vehicles. G30 OAT and Peak Global OAT do NOT use 2-EH Nice to know.2-EH is prone to damage plastics like Nylon 6.6 used in intake manifold gaskets and radiators.DEX-COOL uses Ethylhexanoic Acid (2-EH) as a corrosive inhibitor.Class action suit GM may have to pay for intake gaskets on V-6s (V-8s still being determined) Brown Gunk on radiatorcap Need to know.Rust then causes blockages Need to know.Air causes rust of cast iron and formation of ‘Brown Gunk’.Replace cap and check cap seats if radiator contains air.Root cause seems to be air entering system past the cap and leaking intake manifolds.OAT-continued NAPS=nitrates, amines, phosphate and silicate free Nice to know In fact, Ford, Chrysler and others say to not use this type of coolant in their newer models. ![]() The downside of OAT is it is not compatible with other types of coolant (IAT and HOAT). This formula is engineered to offer long-life corrosion protection. OAT (Usually Orange) Organic Acid Technology (OAT) is the formula found in DEX-COOL®, and is usually the antifreeze/coolant of choice for GM, VW, and many Japanese/Asian vehicles. IAT antifreeze can contain: Silicates (possible abrasive dropouts) Phosphates Borates IAT (Usually Green in Color) IAT is considered obsolete and can cause early failure of ceramic-phenolic seals used in newer water pumps. This solution offers fast-acting corrosion protection, but the additives are quickly consumed, exposing the cooling system to possible corrosion problems if not changed regularly. IAT Inorganic Additive Technology (IAT) is the traditional green coolant used in most older vehicles. Should not be used as an indicator what to use-some Chrysler vehicles used HOAT coolant that was green 19 Need to know It also helps us identify the additive package. add color (dye) 18 Need to knowĬolor The color helps us identify a coolant leak. Need to knowĪdditives The major additives: 1.
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