Engine, diesel, 5.7L V8

Years 1978–85 Models 6 Factory citations 2

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Also described as 350 cid Olds diesel V8Olds 350 diesel V8Engine, 5.7L V8 diesel, Oldsmobile

Also documented for Buick Chevrolet GMC Oldsmobile Pontiac

Documented applications

DeVille / Calais

1980–82 Confirmed

Optional

Seville

1978 (mid) –79 Confirmed

First GM diesel passenger car
1980–82 Confirmed

Standard at 1980 launch per most references

Fleetwood Brougham / Brougham — D-body (1983–1992)

1983–1985 Single-source

the Oldsmobile 350 diesel V8; Wikipedia's Oldsmobile Diesel engine article lists the Fleetwood Brougham through 1985, and the Fleetwood Brougham article dates the LF9 through 1985 (one source); shared code, printed for the Chevrolet Caprice in the Caprice kit's 1983 and 1985 engine pages, which is sibling corroboration only (the Caprice kit's 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 — 1985 Chevrolet Caprice, p.18.

DeVille — C-body, rear-drive (1983–1984)

1983–1984 Single-source

the Oldsmobile 350 diesel V8; Wikipedia's DeVille article names the LF9 for this generation, and its Oldsmobile Diesel article lists the DeVille through 1984 (one source); 1984 also printed for the sibling Buick Electra in gnttype.org's 1984 Buick VIN table (T3, a sibling source that does not lift the row); its 1983 Electra block repeats the 1984 one and is not counted

Eldorado — E-body (1983–1985)

1983–1985 Single-source

the Oldsmobile 350 cu in diesel; Wikipedia's Oldsmobile Diesel engine article prints LF9 and lists the Eldorado, and its Eldorado article prints LF9 in the generation's engine list and calls the diesel an option in all years (one Wikipedia source); 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; the NICB Cadillac engine tables list a diesel V8 without an RPO code (the VIN letter is not legible in the OCR text)

Seville — K-body, front-drive (1983–1985)

1983–1985 Single-source

Wikipedia's Seville article lists the LF9 diesel V8 through 1985, so the whole span is dated by that one line; the NICB 1983 and 1984 Cadillac VIN tables print a 5.7L V8 diesel engine symbol but no RPO code, so they do not name the code; Wikipedia's article for the nameplate is one source

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