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  • Hemmings Muscle Machines

    SWAP MEET

    Nov 27, 2022 4 minutes

    UNDERSTANDING ANTIFREEZE LINGO

    Q: Can I upgrade from OAT to HOAT antifreeze, and what is different about them? I have a late-model Ram 1500 truck that calls for OAT.

    Kevin Herbert Via hemmings.com

    A: OAT (organic acid technology) antifreeze is usually orange in color and was used extensively by General Motors to address the differences in compatibility with the metallurgy in various engine components being used at that time. This product also extends the interval between system flushing and replacement of fluid (it is said to last longer). It was later adopted for use in Chrysler cooling systems as well. Made from organic

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