2.5 L (151 cu in) L4, throttle-body fuel injection (VIN R)

Years 1982–92 Models 2 Factory citations 11

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Also described as Engine, 2.5 L (151 cu in) L4, throttle-body fuel injection

Also documented for Chevrolet Oldsmobile Pontiac

Documented applications

Century — A-body (1982–1996)

1982–1992 Factory-verified

The "Tech IV" four: about 90 hp to 1988, 110 hp from 1989; shared A-body engine code, cited from the Chevrolet Celebrity kits for 1983–1990 (the 1983–1985 specification pages head a column with it, the 1986–1988 and 1990 pages pair other options with it, and the 1989 order guide lists it as a no-charge engine; the 1987 exclusion remark on page 42 dates no year, so the 1987 page cited is 43); 1982 and 1991–1992 from Wikipedia's Iron Duke article, which gives the Tech IV to the Century 1982–1992

GM Heritage factory kit — 1983 Chevrolet Celebrity, p.6.
GM Heritage factory kit — 1984 Chevrolet Celebrity, p.8.
GM Heritage factory kit — 1985 Chevrolet Celebrity, p.15.
GM Heritage factory kit — 1986 Chevrolet Celebrity, p.43.
GM Heritage factory kit — 1987 Chevrolet Celebrity, p.43.
GM Heritage factory kit — 1988 Chevrolet Celebrity, p.46.
GM Heritage factory kit — 1989 Chevrolet Celebrity, p.10.
GM Heritage factory kit — 1990 Chevrolet Celebrity, p.40.

Skylark — X-body (1983–1985)

1983–1985 Factory-verified

the standard four-cylinder; Wikipedia's Skylark article names LR8 in its fifth-generation infobox and gives the Iron Duke four to 1985; gnttype.org's 1984 Buick VIN table prints it for the Skylark (VIN R), a second source (owner ruling, 2026-11-05: a T3 page that names the code for the nameplate, with Wikipedia dating every year); shared X-body code; cited from the Chevrolet Citation kit, whose engine pages print it with its model year

GM Heritage factory kit — 1983 Chevrolet Citation, p.10.
GM Heritage factory kit — 1984 Chevrolet Citation, p.10.
GM Heritage factory kit — 1985 Chevrolet Citation, p.7.

This page aggregates every documented appearance of LR8 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.