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The Rotax 582 two stroke engine, both blue and grey heads, require approximately 4.5 liters of coolant solution made up of 50% non silicate anti-freeze coolant, and 50% distilled water. This is at least what the manufacturers advise. However there is some contention about with most agreeing with whatever the manufacturer Rotax stipulates, but there are also many insisting on more like 75% water and 25% coolant. My personal opinion is to stick with the manufacturers advice if the engine is in good health and running at recommended temperatures, but if the engine has over heating issues due to aging/wear and tear, then more water is always cooler and also plays the role as a thinning agent allowing a more thorough and faster flow around the engine.

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13y ago

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