SX package, Cutlass Supreme (drivetrain, 12-bolt rear, cutout rear bumper w/trumpet exhausts, SX badges)

Years 1970, 1972–75 Models 2 Factory citations 1

Also described as Ninety-Eight Regency package

Documented applications

Cutlass / 4-4-2

1970 Disputed

Std engine L-33 320 hp 455 2-bbl (to ~Feb 1970), then L-31 365 hp 4-bbl; ~7,197 SX built. Note: option-code lists assign Y-79 to "Cutlass Salon" (FAQ) / "98 Regency 1972–75" (Mileposts) — year-dependent reuse. Factory kit confirms 1970 usage: "Y79 Cutlass Supreme Performance Package"

GM Heritage factory kit — 1970 Oldsmobile 442 Info Kit, p.232.

Grade note: confirmed (1970 SX usage per FAQ W-machine page + factory kit); disputed (later-year application)

Full-Size 88 / 98

1972–75 Disputed

Per AutomotiveMileposts; Olds FAQ assigns Y-79 to Cutlass Salon/1970 SX — code reused across years

This page aggregates every documented appearance of Y-79 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.