Coolant options

Dexcool doesn't like air in the system, weird oxides form, sludge like stuff. That's why lots of the stuff that takes it has the rad cap where it is - away from the radiator.

Zerex G-05 is good modern HOAT coolant that is backwards-compatible. But you should still drain, rinse ( drive for 45 min with flush and water, then again with distilled) and refill if you plan on changing to something different