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The use of antifreeze does not depend on whether an engine is 2 or 4-cycle.  It depends on whether an engine is made of cast iron components or of fabricated steel components.  EMD engines are in the latter category, and they happen to be 2-cycle.  Therefore the 2-cycle aspect is associated with the antifreeze issue, but it is not a cause of it.  <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> Engine made from fabricated components are more prone to leakage from internal seals that are less perfect that those in cast iron engine components.  Such leakage can allow engine coolant to get into the crankcase oil.  Antifreeze kills the lubricating ability of the engine oil, which can result in serious damage to the crank bearings.   <o:p></o:p> Caterpillar diesels, for instance, are built with cast iron bodies, so they can be run with antifreeze without risk of internal leakage resulting in bearing failure.  This gives them the advantage of being able to be shut down during idle times to save fuel during freezing weather.  Whereas an engine with water instead of antifreeze needs to be drained if shut down during freezing weather.
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