GM's Red Coolant

[albertjames]

If your car comes with a long-life coolant, you should try to add only long-life coolant when the reservoir is low. There's no danger in mixing traditional coolant and long-life coolant, except that once you go beyond 15 percent traditional in your mix, you'll get the shorter life of the traditional stuff. And since the long-life stuff costs a lot more, that's kind of wasteful.
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