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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    LF9 Factory-verified

    Oldsmobile · Regular Production Option

    Engine, diesel, 5.7L V8

    Years 1978–85 Models 6 Factory citations 10
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    Also described as 350 Olds diesel V-8350 diesel V-8

    Also documented for BuickCadillacChevroletGMCPontiac

    Documented applications

    Custom Cruiser — B-body (1983–1990)
    • 1983–1985 Single-source

      350 cu in; Wikipedia's Oldsmobile Diesel engine article lists the LF9 for the Custom Cruiser through 1985, and its Custom Cruiser article names the LF9 diesel as an option through 1985; shared B-body code, cited from the Chevrolet Caprice kit (1983 and 1985 engine pages; the 1984 page names the diesel only in a battery remark, which dates nothing, so 1984 rests on Wikipedia)

      GM Heritage factory kit — 1983 Chevrolet Caprice, p.13.
      GM Heritage factory kit — 1984 Chevrolet Caprice, p.40.
      GM Heritage factory kit — 1985 Chevrolet Caprice, p.18.
    Cutlass Supreme — G-body (1983–1988)
    • 1983–1985 Single-source

      optional; Wikipedia's Oldsmobile Diesel article lists the Cutlass Supreme through 1985 and its Cutlass Supreme article withdraws the diesel V8 for 1986; eightiescars.com prints LF9 for the 1985 coupe; shared G-body code, cited from the Chevrolet Monte Carlo kit (1983–1984)

      GM Heritage factory kit — 1983 Chevrolet Monte Carlo, p.30.
      GM Heritage factory kit — 1984 Chevrolet Monte Carlo, p.36.
    Delta 88 — B-body (1983–1985)
    • 1983–1985 Factory-verified

      shared B-body powertrain code, cited from the Chevrolet Caprice kits (1984 also from the air-conditioning weight remarks); 350 cu in; Wikipedia's Oldsmobile diesel article lists the LF9 for the Delta 88, and its Eighty-Eight article names the 350 diesel as a 1983 option

      GM Heritage factory kit — 1983 Chevrolet Caprice, p.13.
      GM Heritage factory kit — 1984 Chevrolet Caprice, p.7.
      GM Heritage factory kit — 1984 Chevrolet Caprice, p.38.
      GM Heritage factory kit — 1985 Chevrolet Caprice, p.9.
      GM Heritage factory kit — 1985 Chevrolet Caprice, p.18.
    Ninety-Eight — C-body, rear-drive (1983–1984)
    • 1983–1984 Single-source

      the Oldsmobile 350 diesel V8; Wikipedia's Oldsmobile Diesel article lists the LF9 for the Ninety-Eight through 1984, and the Ninety-Eight article's generation infobox names the LF9 diesel; shared C-body code, 1984 also cited from the Buick Electra block of gnttype.org's 1984 Buick VIN table, which prints the LF9 (T3, a sibling source that does not lift the row)

    Toronado — E-body (1983–1985)
    • 1983–1985 Single-source

      the Oldsmobile 350 cu in diesel (VIN code N); Wikipedia's Oldsmobile Diesel engine article prints LF9 and lists the Toronado through 1985, and its Toronado article names the diesel V8 for the generation; shared E-body code, cited from the Buick Riviera: gnttype.org's 1984 Buick VIN table prints LF9 for the Riviera Luxury, sibling corroboration of the code, T3, which does not lift the row; its 1983 table repeats the 1984 one; the 1983 and 1985 NICB manuals print VIN code N in the Oldsmobile engine table without an RPO code

    This page aggregates every documented appearance of LF9 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.