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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    M-40 Factory-verified

    Oldsmobile · Regular Production Option

    Turbo Hydra-Matic (TH-400)

    Years 1966–69 Models 1 Factory citations 1

    Also described as TH-400 automatic

    Documented applications

    Cutlass / 4-4-2
    • 1966–67 Confirmed

      First TH-400 4-4-2s; W-O-G code on 1967 W-30

    • 1968–69 Factory-verified

      OW code on W-30; 1969 factory service list: "Turbo Hydra-Matic Transmission"

      GM Heritage factory kit — 1969 Oldsmobile 442 Info Kit, p.247.

    Related codes · mentioned in these notes

    W-30

    This page aggregates every documented appearance of M-40 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.