"Waterwetter" is a coolant additive made by Red Line Oil, a performance fluids manufacturer. It is added to normal coolant to improve the heat transfer ability, in order to lower engine temperatures.
On first glance, Waterwetter would seem to be another 'magic' product. After all, the engine cannot run at a lower temperature unless a low-temperature thermostat is installed. However, it is important to realize that there is a difference between the thermostat temperature and the engine temperature. The thermostat regulates coolant temperature. The engine block, which is creating heat during the combustion cycle, is at a higher temperature.
If the coolant has poor heat transfer characteristics, the coolant is unable to absorb heat from the block and carry it away. This leads to a significant difference in temperature between the block and the coolant, with the block becoming hotter. Improving the heat transfer characteristics of the coolant allows it to absorb more heat, making the block run cooler.
The reverse is true at the radiator. A fluid with poor heat transfer may not be able to transfer the accumulated heat to the radiating surfaces. This can lead to heat buildup in the cooling system.
Whether Waterwetter is 'worth it' is up to the individual. Few people report performance gains with it; rather, it is viewed as simply a prudent thing to use.
Majority of Summer only DSM owners run Distilled Water + WatterWetter only with no ill effect. Some say that a little more lubrication is required for the water pump so 80% Distilled Water / 20% Coolant + Water Wetter.
If your DSM sees near freezing temps, no less than 50/50. Unless you want to blow your freeze plugs.
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