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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    L03 Single-source

    Buick · Regular Production Option

    Engine, 5.0L V8, electronic fuel injection

    Years 1991 Models 1
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    Also documented for CadillacChevroletGMCPontiac

    Documented applications

    Roadmaster — B-body (1991–1996)
    • 1991 Single-source

      170 hp; the standard engine of the 1991 car, the Estate Wagon only; Wikipedia's Roadmaster article names L03 and dates it 1991; shared B-body code; Wikipedia's Oldsmobile Custom Cruiser article (the B-body wagon sibling) also names the L03 and dates the 5.0L 1991, but as a second Wikipedia article it is not counted as an independent source; the Chevrolet Caprice kit's 1991 specification pages (pp.6 and 45) print LO3 but no readable model year (the p.45 year field prints only the issue date 12-89), so they date no year and are not cited

    This page aggregates every documented appearance of L03 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.