Link Note the section on SAE J814:
Quote:
Clean potable water, low in chloride, sulfate, and hardness is generally acceptable. Brackish or undrinkable water should not be used. Softened, deionised, or distilled water is ideal to dilute engine coolant concentrate.
I don't think it unreasonable to trust the Society of Automotive Engineers. Do you have links or other documentation to back up your statement? I just filled my SVT with distilled water two weeks ago; I really don't want to do another flush if I really don't have to.
