Engine, diesel, 5.7L V8

Years 1983–85 Models 5 Factory citations 7

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Also documented for Cadillac Chevrolet GMC Oldsmobile Pontiac

Documented applications

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

1983–1984 Single-source

the Oldsmobile 350 diesel V8, VIN code N; Wikipedia's Oldsmobile Diesel article lists the LF9 for the Electra through 1984; gnttype.org's 1984 Buick VIN table prints it in the Electra Limited and Park Avenue block, a second source for 1984; its 1983 Electra block is word for word the 1984 one, so 1983 rests on Wikipedia alone and the row stays single-source

Estate Wagon — B-body (1983–1990)

1983–1985 Factory-verified

350 cu in; Wikipedia's Buick Estate article names the LF9 diesel among the generation's engines and says the 5.7 litre diesel was available through 1985; gnttype.org's 1984 and 1985 Buick VIN tables print it in the B-body block that includes the Estate wagon, a second source; shared B-body code; cited from the Chevrolet Caprice kit (1983, 1985)

GM Heritage factory kit — 1983 Chevrolet Caprice, p.13.
GM Heritage factory kit — 1985 Chevrolet Caprice, p.18.

LeSabre — B-body (1983–1985)

1983–1985 Factory-verified

the Oldsmobile 350 cu in diesel (VIN code N), optional; Wikipedia's Oldsmobile Diesel article prints LF9 for the LeSabre through 1985 and its LeSabre article names the 350 diesel in each of these years; gnttype.org's 1984 and 1985 Buick VIN tables print it for the LeSabre; the 1984 kit citation is p.40's heavy-duty battery remark (with RPO-LF9 diesel); shared B-body code; cited from the Chevrolet Caprice kit

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.

Regal — G-body (1983–1987)

1983–1985 Factory-verified

Wikipedia gives the 5.7L diesel V8 to the Regal through 1985, and buickturboregal.com lists LF9 among the Regal's codes; gnttype.org's VIN tables do not list it under the Regal; shared G-body powertrain code, cited from the 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.

Riviera — E-body (1983–1985)

1983–1985 Confirmed

the Oldsmobile 350 cu in diesel (VIN code N), optional; Wikipedia's Oldsmobile Diesel engine article lists the Riviera for 1981–1985 and its Oldsmobile V8 article names LF9 as the 350 diesel; gnttype.org's 1984 Buick VIN table prints LF9 for the Riviera Luxury, a second source (owner ruling, 2026-11-05: a T3 page that names the code for the nameplate, with Wikipedia dating every year), its 1983 table repeating the 1984 one; the 1983 and 1985 NICB manuals print VIN code N (the 1983 manual in its 1982 column and not its 1983 column), so those pages do not show the code

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