Engine, gas, 6 cylinder, 4.2L, multiport fuel injection, L6, aluminum, DOHC, GM

Years 1987, 1989, 2004–07 Models 2 Factory citations 3

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Also described as 2.0 L (121 cu in) L4, OHV, throttle-body fuel injection (VIN 1)

Also documented for Chevrolet GMC Oldsmobile

Documented applications

Rainier — GMT360 (2004–2007)

2004–2007 Factory-verified

the 2004 lists word it as "engine, gas, 6 cylinder, 4.2L, multiport fuel injection, DOHC, L6, aluminum, GM"

GM factory document — 2004 buick rainier 2wd rpo code list, p.1.
GM factory document — 2007 buick rainier rpo code list, p.1.

Skyhawk — J-body (1982–1989)

1987, 1989 Factory-verified

88 hp in 1987 and 90 hp in 1989, when it was the only engine (Wikipedia); Wikipedia's Skyhawk article dates it 1987 and 1989; gnttype.org's 1987 Buick VIN table prints it for the Skyhawk; 1988 is left out because the Skyhawk article says the OHV engine was not offered for 1988, the 1989 NICB Buick table prints VIN 1 in its 1988 column, and Wikipedia's 122 engine article gives the Skyhawk 1987–1989; the 1989 Cavalier kit is the second source (a Skyhawk source names the code and dates both years); shared J-body code; cited from the Chevrolet Cavalier kit (1989)

GM Heritage factory kit — 1989 Chevrolet Cavalier, p.22.

This page aggregates every documented appearance of LL8 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.