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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    LG0 Single-source

    Oldsmobile · Regular Production Option

    Engine, 2.3L L4, DOHC, high output, fuel injection (Quad 4)

    Years 1990–91 Models 2
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    Also described as Engine, 2.3L I4, DOHC, high output (Quad 4)

    Also documented for ChevroletPontiac

    Documented applications

    Calais — N-body (1985–1991)
    • 1990–1991 Single-source

      180 hp, 5 speed manual only; Quad 442 and International Series; Wikipedia's Quad 4 article lists the International Series for 1989–1991 and the Quad 442 for 1990–1991, while the Calais article's engine list gives the 180 hp engine for 1990–1991 only, so 1989 is left out; not independent of each other

    Cutlass Supreme — W-body (1988–1997)
    • 1990 Single-source

      180 hp; Wikipedia's Cutlass Supreme engine table prints LG0 for 1990 alone, and its text pairs the high output Quad 4 with the Getrag 5 speed manual in 1990; no listed kit page prints it

    This page aggregates every documented appearance of LG0 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.