- 1984, 1986–1989 Single-source
1985 is left out because the page that prints it carries no model-year field; shared A-body code; cited from the Chevrolet Celebrity kits; no Ciera source names it, so the row rests on the kit pages alone
GM Heritage factory kit — 1984 Chevrolet Celebrity, p.41.GM Heritage factory kit — 1986 Chevrolet Celebrity, p.41.GM Heritage factory kit — 1987 Chevrolet Celebrity, p.41.GM Heritage factory kit — 1988 Chevrolet Celebrity, p.45.GM Heritage factory kit — 1989 Chevrolet Celebrity, p.11.
G66 Single-source
Also documented for BuickChevroletPontiac
Documented applications
This page aggregates every documented appearance of G66 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.