OAT antifreeze has a replacement interval of 150,000 miles or generally 5-7 years, and depending on the make, is either silicate free, phosphate free, or both. It breaks down so bad, that it can even begin to conduct electricity through electrolysis and begin eating your system from the inside! Because of this, European and Japanese manufacturers began working on OAT, or Organic Acid Technology Antifreeze. The life of IAT antifreeze breaks down heavily around 36,000 miles in the system, causing massive corrosive issues once the coolant begins to break down.

Phosphates on the other hand, over time, dried and corroded anything rubber – like water pump seals. For example, silicates caused massive amounts of scale in the system when in contact with aluminum, further causing cooling issues. This was especially important when the primary item that coolant was protecting from was rust in cast iron in engine blocks, heads, and other engine components in the cooling system made from iron.ĭuring the 1980’s – as more and more vehicles began to use aluminum parts and rubber seals in the system, more problems began to occur. It was fortified with silicates and phosphates, which were used primarily to keep corrosion down within the system. Traditional antifreeze (the old green stuff) is known as IAT antifreeze, which refers to Inorganic Acid Technology. However, always take the suggestion of the car manufacturer or an experienced technician before choosing a coolant.The first thing to understand is the different basis for certain types of antifreeze. HOAT coolant helps to keep the engine cool in all types of temperatures. There is a chance that they are not selling an authentic product. But beware of the dealers who sell this coolant at a low price. If there is no urgency, purchase from online stores that offer it at a cheaper rate. Usually, one gallon of OAT will cost you $50-$60. OAT coolant costs much higher than the HOAT.

While the ideal runtime of HOAT is five years and 1000K miles, OAT lasts for ten years and 150K miles.Īnother significant factor that distinguishes these two coolants is the price. The second difference in these is their lifetime. While OAT is purple, HOAT comes in Orange. The most evident difference is their color. There are several points on which the Hybrid OAT coolant differs from the OAT variant. The Ideal Frequency of Changing Engine Coolant.Oil in Coolant Reservoir: How Severe It Is?.Instead, it cancels the benefits of one variant. Mixing multiple coolants will not ensure enhanced performance. Since the HOAT coolant is not compatible with OAT/IAT coolants, do not mix these two. To stop being frozen, it uses both silicates and organic acids. While using HOAT, you need to mix additives into the system as the engine manufacturer suggested or after every 25k miles. It may also not be as long-lasting as OAT, but it does provide better protection against rust. This coolant does not need regular changing like IAT. It functions with equal efficiency at very high and low temperatures, and therefore it can serve for more than five years. Hence, it has to deal with different operating temperatures.ĭue to hybrid-engineered chemical composition, HOAT antifreeze stops the rust from building up. While doing so, it goes through metal passageways. Like every other type of coolant, the prime function of HOAT is to cool the car engine. (Source: JK-Forum) How Does the HOAT Coolant Function? You must flush out this coolant from the car’s system after five years or every 150,000 miles. This best serves new cars, while many European and Asian vehicle manufacturers, including Ford and Chrysler, recommend HOAT coolant for their vehicle models. This coolant contains added silicates that offer additional protection against corrosion and rusting on the aluminum components of the vehicle. Typically, its color is dyed yellow, but it also comes in turquoise, pink, blue or purple colors. This coolant is a mixture of IAT (Inorganic Acid Technology) and OAT (Organic Acid Technology) coolants. HOAT stands for Hybrid OAT or Hybrid Organic Acid Technology. There are several coolants in the market, and you must learn about their variants before choosing the ideal one for the car. It is the coolant that keeps the heat in control and saves the engine from an explosion. Engines are the most complex part of a car and it generates massive heat.

Orange hoat coolant