Buick 1993 Roadmaster Owner's Manual page 259

er to your cooling system
can be dangerous. Plain water, or some other
liquid like alcohol, can boil before the proper
coolant mix will. Your vehicle's coolant warning
system is set for the proper coolant mix. Wi'th
plain water or the wrong mix, your engine could
get too hot but you wouldn't get the overheat
warning. Your engine could catch fire and you
or others could be burned. Use a
50/50
mix of
clean water and a proper antifreeze.
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