I live in arizona. The only reason I don't use water for coolant is because coolant has corrosion resistance to internals lol. The coolant you use does not really matter..as long as its actual coolant and properly mixed.
Well i see you live in seattle, so you should actually mix more coolant and less water because of the harsher winter weather. You should consider 60% coolant and 40% water so you should mix it yourself.
I like to use 80% water and 20% coolant and a bottle of water wetter. The summer is pretty hot in TX. In october i flush it again and use prestone 50/50. I have about twenty cases of that **** sitting in my shop. Along with other brands of coolant.
The water pump bearings of older (and newer?) Hondas are known to be vulnerable to non-OEM coolants, with some exceptions. I have been using the orange Havoline Dexcool in my Honda for almost seven years (changing every 2 years or so, which is probably too often) and have had no problems. I have had problems with early water pump failure before when using the green Prestone. I know other Honda veterans who swear by the orange Havoline Dexcool as well.
The only coolants I would use are OEM or the orange Havoline Dexcool. I buy the Dexcool undiluted, since this saves money, picking up a gallon of distilled water at the grocery for mixing.
I like to use the water wetter as well. It can drop the temp in the radiator a few degrees all by itself. But yes; as "koa", said I would use more coolant than water in the winter. I change mine out every spring with the Prestone and Water Wetter to help with the heat.
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