Characteristics of Antifreezeīoat and RV antifreeze comes in different strengths and colors, but there's no standard for what the colors mean. Never let it leak into the water and clean spills promptly. ![]() Most engine coolant contains Ethylene Glycol or other toxic chemicals and should be used nowhere but in the self contained fresh-water side of your engine cooling system. The color is different - green or orange - and there are prominent poison warnings on the label. One tipoff that you're looking at engine coolant instead of antifreeze is the price - coolant is much more expensive than non-toxic, propylene glycol based anti-freeze. These are for RV's with engines, not for the household systems you'd find in the living areas of RV's with or without engines. Your boat's engine should have a proper coolant balance, true, but that’s independent of the winterizing process. Engine CoolantĮngine coolant is toxic and should never, ever be used for any aspect of boat winterization. Coolant may be labeled and marketed as "Engine Antifreeze/Coolant" but it is a distinct product. It's chemically very different from antifreeze that we'd use in winterizing a boat. It's a common misnomer to refer to "engine coolant" as just "anti-freeze." Engine coolant has a different purpose than anti-freeze, though one function it performs reduces freezing risks in engines. The Difference Between Antifreeze and Engine Coolant
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