Engine, 4.1L V6, 252 cu in, 4 barrel

Years 1980–84 Models 3

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Also described as 307 CID gas V-8

Also documented for Buick Cadillac

Documented applications

Toronado

1980–82 Single-source

Became std engine

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

1983 Single-source

Buick-built V6, VIN code 4; shared C-body code, also cited from the Buick Electra; Wikipedia's Buick V6 article lists the LC4 for the Oldsmobile 98 through 1983, and its Ninety-Eight article says the 4.1L V6 was no longer available for 1984, so 1984 is left out; the sibling gnttype.org Buick table is not counted for 1983 because its 1983 Electra block repeats the 1984 one

Toronado — E-body (1983–1985)

1983–1984 Single-source

the Buick 252 V6 (VIN code 4); Wikipedia's Buick V6 engine article prints LC4 and lists the Oldsmobile Toronado through 1984, matching its Toronado article (252 V6 through 1984); shared E-body code, cited from the Buick Riviera: gnttype.org's 1984 Buick VIN table prints LC4 for the Riviera Luxury, sibling corroboration of the code, T3, which does not lift the row; its 1983 table repeats the 1984 one; 1985 is left out because the 1985 NICB Oldsmobile engine table prints VIN code 4 in its 1984 column but not in its 1985 column and Wikipedia gives the engine through 1984

This page aggregates every documented appearance of LC4 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.