10/30/2023 0 Comments Mixing gold and green coolantThis is an Antifreeze where manufacturers use Nitrates to literally make a “tweener” antifreeze – that’s something in between IAT and OAT – meaning, it’s a jack of all trades, and a master of none. So what exactly are the “all makes” coolants? They are HOAT – Hybrid Organic Acid Technology. For instance, if the reservoir of your VW you see purple, and you’re adding a VW specific purple coolant, it makes it very easy to see that everything is good! All coolant of this variety is either silicate free, phosphate free, or both, and is designed specifically to meet the needs of that particular manufacturers’ testing. These colors added by the manufacturer are more-or-less markers to tell you first and foremost, what is in your system currently, and second, an easy identifier to tell you what the right coolant is, and that you are adding the right stuff to the system. These coolants, either Subaru Blue, Toyota Red, or VW / Audi G12, which is Purple, are the reasons why sticking with the factory-spec’d coolant intended for the vehicle is highly recommended over going with an “all makes” coolant – it is far superior. Other manufacturers began tweaking and making OAT coolant better through technology – providing coolant that was either safer for the environment, had even better anti-corrosion capability, or even had change intervals as long as 10 years. OAT antifreeze began in the American market with GM’s introduction to Dexcool Orange in 1994. 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. The first thing to understand is the different basis for certain types of antifreeze.
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