It comes in too many colors to pretend this type is color-coded. Instead of OAT, most new cars now use a "hybrid" antifreeze that's formulated with both OAT and the silicate inhibitors from green (Japanese hybrids have different inhibitors). VW, Audi, and Porsche are OAT users, too, but most others have resisted. Ford changed a few models to OAT, then backed away from it. General Motors pioneered this chemistry starting with 1996 models in the U.S. One of the new types is "organic acid technology," or OAT. Most of what you see on the shelves at Wal-Mart and AutoZone is conventional, including the yellow bottles of Prestone and the white bottles of Zerex. It turns out that an antifreeze transplant into older cars will work fine with one of the new types the other will probably kill the patient. The "old" antifreeze technology started in the '60s, improved in the '70s, Turcotte says, and was superseded in cars of the '90s by two new technologies. Of course, no doctor writes the prescription before he considers the patient. I was hoping that technology, as it marches relentlessly toward obsoleting everything I own, might also have created new antifreeze formulas that would bring forbearance and frustration to the chemicals frolicking under my aging radiator caps. The next stage: As detritus migrates through the system, it settles in the most confined spaces. A sticking thermostat can be an early indicator. Perhaps the battle is already going badly in your car. The freeze protection is permanent, but the additives are consumed in battle, so to speak.Ībout half the additive is made of buffers to control acid buildup the other half is corrosion inhibitors to protect metals.
In normal circumstances, you also gain corrosion resistance. When you dilute that blend 50-50 with water, as the makers intend, you push down the freeze point to minus 34 degrees Fahrenheit. Modern antifreeze, he says, is 96-percent ethylene glycol, which provides the freeze protection, and four-percent additives. How and Why You Should Check Transmission Fluid.
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