This coolant type is a combination of OAT (Organic Acid Technology) and IAT (Inorganic Acid Technology). HOAT means Hybrid Organic Acid Technology, or Hybrid OAT. Car has 148k miles and I am guessing something other than a coolant related failure will prompt her to get a new car.Does it matter what brand of coolant I use? What is HOAT Coolant? Given the mileage she drives I will just top up with Napa Extended. I am sure they did not flush but after two TB and WP replacements most of the coolant is now Napa Extended, if they are telling us the truth. They did a hack job with aftermarket junk and had to redo the job less than a year later. She has a 2003 Lexus ES 300 which needed a new timing belt before I got involved. I was asking for a friend whose cars I have been maintaining since her husband died. I am a coolant snob and will not use anything but OEM factory fill in my cars. The genuine stuff is just not that much more expensive. I personally won't use the "universal" stuff myself. That said, if you do a FULL flush so you can be sure that the previous fluid is almost entirely gone, then switching many cars to use only the "universal" stuff can potentially work fine. Instead of the coolant being good for 5 years and/or 100,000 miles (or more, in the case of Nissan, etc.), they might only be good for 2 years or 30,000 miles before they run the risk of causing problems. As such, if you mix them into the coolant in an engine that is already using a non dexcool coolant, you'll end up screwing up the chemistry of the fluid, and this will always negatively impact the effectiveness of the coolant, ultimately leading it to precipitate early, or potentially reduce their ability to mitigate/prevent corrosion, etc. These coolants are both also good for 5-years or 100,000 miles before they are used up, or risk precipitating out, etc.Īs far as I know, all "universal" coolants are essentially clones of dex-cool, based on the chemicals used to make them what they are. This results in a very specific chemistry for each coolant, or in some cases 'families' of coolants, such as is the case with Mazda FL22 and Motorcraft Premium Gold (G-05) coolants, which are chemically the same, just with different coloration. However, one thing I can say is that manufacturers utilize a specific chemistry for their coolants based on the physical makeup of their engines, and other associated systems (radiators, etc.), as well as the operating conditions under which their engines run. form corrosive by-products and/or precipitate solids?Ĭan I name one specific example? Not sure about that. Ok, can you give a specific example of where the Napa formula would be chemically incompatible with another coolant, e.g. It's an Extended/Long Life OAT AF that does NOT contain 2eha. The only universal 'type' AF I would use (with a complete exchange) and am using in a Tacoma is Peak Global Lifetime. Most the spec'd AFs are now readily available as aftermarket AFs. And if it specs DexCool that's what I'd use. Generally I'd choose the type AF the car specs. Personally, it wouldn't be my first choice and unless the vehicle specs Dex Cool I would avoid it. Napa Extended AF has been discussed here before and it is made by Old World, and it's most like if not identical to Peak Long Life AF which contains 2eha. However to get 'extended/long life' interval a complete change needs to be done. Because of their generally neutral color they claim they can be added to most any AF. They all contain 2eha which is major inhibitor found in DexCool. They make up the majority of the AF sold under store names and brand name. I think you'll find that most if not all the 'Universal Dexclones" OAT AF's make the same claim.
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