My 23 was low in the reservoir, I topped it off with NAPA 50/50 conventional. When the time comes to flush, I will probably go with engine ice, but for topping off the NAPA stuff has worked fine.
Any antifreeze is fine, if it's green then add green, you just don't want to mix colors. If you want to switch colors just flush out the old and add whatever color you want.
Yamacool is Yamaha's special blend of ethylene glycol based coolant and was designed to prevent your Yamaha from boiling over when the competition heats up.
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