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Propylene glycol (PG) is gaining in popularity as an engine coolant in market areas concerned about the toxicity of ethylene glycol (EG). With the possibility of PG coolants being used in heavy duty diesel engines, the requirement to control cylinder liner cavitation must be maintained. The purpose of this test program was to compare the ability of propylene glycol and ethylene glycol based heavy duty engine coolants to suppress cavitation of wet-cylinder liners in heavy duty diesel engines. The first task was to develop an engine test that would duplicate liner cavitation in a short time. This was accomplished with a 250 hour accelerated cycle test of a modified Deere six cylinder, 10.1 liter engine. The next step was to establish a baseline with both PG and EG using a modified GM 6038 engine coolant mixed 50 percent by volume with American Society of Testing and Materials (ASTM) standard corrosive water.