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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    LT6 Factory-verified

    Buick · Regular Production Option

    Engine, diesel, 4.3L V6

    Years 1983–84 Models 1 Factory citations 1
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    Also documented for ChevroletOldsmobile

    Documented applications

    Regal — G-body (1983–1987)
    • 1983–1984 Factory-verified

      gnttype.org's 1983 and 1984 VIN engine tables; Wikipedia gives the 4.3L diesel V6 to the Regal through 1984; shared G-body powertrain code, cited from the Monte Carlo kit (1983)

      GM Heritage factory kit — 1983 Chevrolet Monte Carlo, p.30.

    This page aggregates every documented appearance of LT6 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.