i have a '04 5 spd aveo sedan with bout 62,000 miles on her. thinking bout flushing the radiator/cooling system. what do you recommend as far as coolant, the green stuff or the orange? and let me get this straight...if you use the green, do you mix with water and if you use the orange, is it just strictly orange and do you ever add water to it or just top it off with more orange? just want to be safe and take some preventive measures. thanks