M3G ✓ Factory-verified

Cadillac · Regular Production Option

Transmission, 9 speed automatic

Years 2025–26 Models 2 Factory citations 9

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Also documented for BuickGMC

Documented applications

XT5 — C1XX (2017–2026) →

• 2025–2026 ✓ Factory-verified

  Luxury, Premium Luxury: S; Sport: not available; upgradeable to M3W when the LGX engine is ordered

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 cadillac xt5 professional vehicles fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.8.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.10.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.36.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.10.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.37.

XT6 — C1XX (2020–2025) →

• 2025 ✓ Factory-verified

  Luxury: S; paired with the base engine columns

  ⛭ GM factory document — 2025 cadillac xt6 fleet order guide, p.8.

  ⛭ GM factory document — 2025 cadillac xt6 fleet order guide, p.63.

Related codes · mentioned in these notes

LGXM3WS

This page aggregates every documented appearance of M3G in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.