STP1335: Evaluation of Engine Coolant Recycling Processes: Part 2

    Bradley, WH
    Senior project engineer, General Motors Service Technology Group, Warren, MI

    Pages: 24    Published: Jan 1999


    Engine coolant recycling continues to provide solutions to both economic and environmental challenges often faced with the disposal of used engine coolant. General Motors' Service Technology Group (STG), in a continuing effort to validate the general practice of recycling engine coolants, has conducted an in-depth study on the capabilities of recycled coolants. Various recycling processes ranging from complex forms of fractional distillation to simple filtration were evaluated in this study to best represent the current state of coolant recycling technology. This study incorporates both lab and (limited) fleet testing to determine the performance capabilities of the recycled coolants tested. While the results suggest the need for additional studies in this area, they reveal the true capabilities of all types of engine coolant recycling technologies.


    corrosion, inhibitors, recycling processes, used reference coolant, virgin control coolant, laboratory testing, fleet testing

    Paper ID: STP38253S

    Committee/Subcommittee: D15.15

    DOI: 10.1520/STP38253S

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