I can offer no opinion on how long the thermostat should last. I will offer an opinion (strong) and say I would not put anything other than Toyota Long Last antifreeze (Pink) from the dealer in my car. It contains a certain chemical additive package with ingredients other antifreezes do not have.....this is what I did and the way I'm going. There will be other opinions on this subject. I did some homework checking this out and all things pointed in that direction.
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