2.8 L (173 cu in) V6, multi-port fuel injection (VIN W)

Years 1987–89 Models 2 Factory citations 3

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Also described as Engine, 2.8L (173 cu in) V6, multiport fuel injection

Also documented for Cadillac Chevrolet Oldsmobile Pontiac

Documented applications

Century — A-body (1982–1996)

1987–1989 Factory-verified

Wikipedia's Century article ends it in 1988; its 60° V6 article and the parts catalog include 1989; shared A-body engine code, cited from the Chevrolet Celebrity kits for 1987–1989 (1987 from the pairing remarks on the page headed Model Year 1987); the 1985 and 1986 Celebrity kits also print LB6, but no Century source gives those years, so they are not claimed

GM Heritage factory kit — 1987 Chevrolet Celebrity, p.41.
GM Heritage factory kit — 1988 Chevrolet Celebrity, p.46.
GM Heritage factory kit — 1989 Chevrolet Celebrity, p.10.

Regal — W-body (1988–1996)

1988–1989 Single-source

the only engine for 1988; 125 hp; Wikipedia's Regal engine list and its 60° V6 article both give LB6 to the Regal for 1988–1989 (one source); no listed kit page covers these years

This page aggregates every documented appearance of LB6 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.