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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    NA5 Single-source

    Oldsmobile · Regular Production Option

    Emissions, standard

    Years 1989 Models 1 Factory citations 1
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    Also documented for BuickChevroletGMCPontiac

    Documented applications

    Cutlass Ciera — A-body (1982–1996)
    • 1989 Single-source internal

      the 1989 order guide lists it as a must-order emissions choice; shared A-body code; cited from the Chevrolet Celebrity kits; no Ciera source names it, so the row rests on the kit pages alone

      GM Heritage factory kit — 1989 Chevrolet Celebrity, p.10.

    This page aggregates every documented appearance of NA5 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.