Supposedly, WaterWetter® also protects aluminum products in the cooling system from excessive heat and cavitation caused by vapor bubbles forming inside the cylinder head and water pump. In theory at least, this reduces the possibility of localized overheating, improving engine longevity. In reviewing the technical literature on Redline’s website, WaterWetter® claims to reduce hot spots in a car’s cylinder head. In my experience, based on their oil products, they deserve this trust. That assessment requires a certain level of trust with Redline products. So WaterWetter®’s benefits either lie elsewhere (or nowhere). Other websites have tested WaterWetter® and also concluded that the overall decrease in coolant temperature is marginal. The post-installation temperature stayed steady at 96 degrees centigrade. The pre-WaterWetter® installation delivered temperatures between 96 and 98 degrees centigrade (or 205 to 208 degrees Fahrenheit for the Americans). I used a VagCom system (reads sensor data directly from the ECU) for my tests. Their technical literature only shows an eight degree Fahrenheit drop in a car with a 50/50 mix of water and coolant, and an eighteen degree Fahrenheit drop for a car running 100 percent water. Strangely, Redline’s own test results don’t square with their ad copy. Translation: WaterWetter® offers all the normal protection benefits of regular coolant to people who don't use regular coolant.
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