MZ5
Well-Known Member
Actually, if you use a coolant which contains silicates, it will eat away at the aluminum in the Honda radiator. Also, never use distilled water in a radiator. Distilled water (deionized) contains no ions, and water by nature wants ions, which it will take from the surrounding metal (aluminum) and deteriorate the radiator from the inside. Prestone does make a universal antifreeze but it cost more $$
Lots of coolants/antifreezes are silicate-free, and they all identify themselves as such; it has nothing to do with being for cars vs. motorcycles. Plain Prestone is both phosphate and silicate free, and as such meets the only requirements Honda has (silicate free ethylene glycol based coolant).
I don't know where you got the idea to not use distilled water, nor the implication that distilled and DI are the same, but both are wrong in the context of this forum. Use distilled (the stuff at the store which says "distilled water") when mixing with concentrated coolant.