![]() Mixing IAT with OAT, HOAT or NOAT antifreezes will not damage your vehicle’s cooling system however the mixture will negate the long life/extended life attributes of these formulations. All of these types are still Glycol based and are compatible with each other but mixing them is not recommended. Further, some antifreeze manufacturers market a “universal” antifreeze they say is compatible with all OAT, HOAT and NOAT formulations. The color of antifreeze is no longer an accurate indicator as to whether it is an IAT, OAT, HOAT or NOAT formulation. Since antifreeze is clear when it is manufactured, and water is clear, dye is used to color the antifreeze for identification and marketing purposes. The normal NOAT service life varies greatly. NOAT and HOAT are very similar in performance characteristics. This makes NOAT also suitable for use in both light duty and heavy duty systems. Nitrited Organic Acid Technology (NOAT) is an OAT with nitrite added. The normal HOAT antifreeze service life is 5 years or 150,000 miles (250,000 km). Another version is dyed yellow and does not contain any recycled antifreeze. One version is dyed orange and contains 10% recycled antifreeze. Several manufacturers are using HOAT for their vehicles. Hybrid Organic Acid Technology (HOAT) is a combination of IAT and OAT. The normal OAT antifreeze service life is 5 years or 150,000 miles (250,000 km). Its first dye colors were orange and red. OAT can be either EG or PG but is mostly EG based. OAT antifreeze had been widely used in Europe before its introduction in North America. Organic Acid Technology (OAT) was the first LLC / extended life coolant introduced in North America in 1994. The normal IAT service life is two years or 30,000 miles (50,000 km). An IAT can be used with either ethylene glycol (EG) or propylene glycol (PG). Inorganic Acid Technology (IAT) is the chemical composition for the traditional antifreezes that are green in color. The member companies of the FMC are confident this issue is not static and new technologies and dye colors will continue to be introduced in the future. The purpose of this bulletin is to describe the dye colors currently available, the chemical technologies being used and which vehicle manufacturers are using which technology based on the information that is readily available at the time this bulletin was published. The below is from an organization that is part of National Autocare Association along with SEMA & MEMA (Motor & Equipment Manufacturer's Association). This is also an issue on Infinity's so here goes:įYI. I am arguing with the hubster over this so he's researching out the ying yang. I can totally imagine the "you didn't use HOAT so your engine isn't covered" line. I have both cooling issues and now possible head issues.so I'll be doing a full drain, flush and HOAT fill before taking it into the dealer. I am less worried about the radiator swap because we would've completely emptied the system.but according to Chrysler non-HOAt or OATs will leave a residue. I've topped off over the years with aftermarket fluids and changed my radiator. ![]() OP- aside from the color- you didn't state which brand you used? Chrysler or Peak etc? Peak is HOAT and OAT compatible as are others. I was once on a forum thread that went 4 pages on water wetter. Aftermarket manufacturers say it makes no difference. ![]() ![]() That's as loaded a question as "what MPG will I get with XX size tire?"Īutomakers maintain their HOAT or OATs are better for long term use and to protect parts.
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