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Difference between oat and hoat coolant9/21/2023 OAT coolants are usually orange or dark green in color. Zerex Original Green or Peak OET are examples of IAT coolants. These coolants are used mainly in older vehicles. The usual change interval is two years or 24,000 miles (about 39,000 kilometers). They typically (but not always) use silicates and phosphates for corrosion protection. IAT coolants are usually green in color and use ethylene glycol as the coolant base. Consult your vehicle's owner's manual or service manual for authoritative specifications. Please note that the colors and change intervals are typical, not gospel. If your vehicle's manual specifies a type of coolant rather than a particular product or a standard like ASTM or JIS, then the following descriptions will give you starting points for choosing the correct coolant. The rest of this page will talk about the different types of coolants and how to know which is the right one for your car. If you're not so lucky, the manual will specify a particular type of coolant. If you're lucky, the correct coolant for your car may be expressed as a particular brand name and product, or by a code such as an ASTM code, G code, or JIS code. If you live far from a dealership, you can check your car's owner's manual to see if there are particular coolants that are approved or recommended for the vehicle. Or you can just have them change the coolant for you if you prefer. The easiest way to choose the right coolant for your car is to buy it from a dealership that sells that make of car. For most people in most climates, a 50:50 mix of coolant and distilled water is the sweet spot. But using too little coolant to water will make the coolant more likely to freeze and will reduce corrosion protection. Using too low a ratio of water to coolant will reduce the coolant's cooling efficiency and may cause overheating. Water is a much more efficient cooler than glycol. The "more is better" school of thought doesn't apply to anti-freeze. Other coolants are 100 percent coolant and must be diluted with distilled water, usually to a concentration of 50 percent except in cold climates (where you may want to use a 65 or 70 percent coolant-to-water ratio, but never more than that). Some coolants come pre-mixed with 50 percent distilled water and should not be diluted prior to use. When buying a coolant, it's important to note the coolant's concentration. If you're not sure which coolant to use, then contact the car's manufacturer. Using the wrong coolant, or mixing certain types of coolants together, may gunk up the engine's cooling system, which can lead to serious engine damage and void the engine's warranty. The different types of engine coolants are more different from each other and less compatible with each other.
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