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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    Z / Z1 Factory-verified

    Cadillac · Regular Production Option

    Anti-freeze −20° / −40° (permanent ethylene glycol)

    Years 1960–62 Models 1 Factory citations 3

    Also described as Anti-freeze −20° / −40°

    Documented applications

    DeVille / Calais
    • 1960 Factory-verified

      All

      GM Heritage factory kit — 1960 Cadillac VVI, p.194.
    • 1961–62 Factory-verified

      All; kit prints Z1 (permanent ethylene glycol)

      GM Heritage factory kit — 1961 Cadillac VVI, p.129.
      GM Heritage factory kit — 1962 Cadillac VVI, p.150.

    This page aggregates every documented appearance of Z / Z1 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.