Don't use dexcool unless it was really cheap; I would use Zerex G-05, that stuff is awesome. its oem in alot of cars and i've had it in my s10 for 4 years after I got fed up with the dexcool sludge despite cap changes and the works.
EDIT: zerex g-05 is a hoat tech coolant, just in case there was any confusion. we're recommending the same thing