Quote:
Originally Posted by tommybwart
why the dealer thermostat.. aren't the aftermarket ones decent enough ?? and what IS the deal with the red versus the green coolant? is the red proprietary or something ? and is there REALLY a diffrence ?
thanks
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Yes.
Toyota Red uses a phosphate anti-corrosion chemistry. The green uses silicates. Both are inorganic chemistries, but they are incompatible. Phosphates do especially well with iron, and do fine with aluminum, and with copper/brass/lead radiators and heater cores. Japanese auto makers prefer phosphates.
Silicates like Prestone green are particularly good with aluminum, not as good with iron, and do fine with copper/brass/lead. They are slightly abrasive, and are slightly more likely than phosphates to cause leaks in water pump seals. European auto makers prefer silicates. Oh, and never mix the red and green.