yes if you change colors make sure you flush it completely, this means not just draining it and adding the new. what i do is lift the sled from the rear, i use an engine hoist, then pull the coolant hose from the front bottom of the engine. remove the fill bottle cap and then remove the bleeder screw from the top of the head. then take a air hose with a rubber tipped nozzle that will fit in where the bleeder screw goes and blow air through the system until no more antifreeze comes out. this will push most of the antifreeze out of the engine and tunnel section. set the sled down, just push the bottom engine hose back on its connector and fill with water until it starts to come out the bleeder screw hole and do the process all over again until the water comes out clear. then blow it out one more time with the air and add your new coolant. usely takes 4-6 flushes. you will need to run the sled several times up to temp. to get most of the air bubbles out, i also leave the filler cap off overnight and fill it again the next morning. would suggest the first time you ride it after a flush and fill take it out for a quick 1/2 to mile run and then check your fluid level again. do this until you don't have to add any antifreeze...