Transmission, 8 speed automatic

Years 2016–18 Models 2 Factory citations 4

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Documented applications

ATS — Alpha (2013–2019)

2018 Factory-verified

GM factory document — 2018 cadillac ats coupe fleet order guide wayback, p.4.
GM factory document — 2018 cadillac ats sedan fleet order guide wayback, p.4.

CT6 — Omega (2016–2020)

2017–2018 Factory-verified

2017: all trims: S; 2018 from the 2018 CT6 order guide: S with the 2.0L turbo and 3.6L cars (a GM document)

GM factory document — 2017 cadillac ct6 fleet order guide wayback, p.4.
GM factory document — 2018 cadillac ct6 order guide copy gm authority, p.59.
2016 Single-source

2016 rests only on GM Authority's LGX engine page (8L45, with the 3.6L; https://gmauthority.com/blog/gm/gm-engines/lgx/); the article does not credit GM for its codes, and no factory list in the archive covers that year

This page aggregates every documented appearance of M5N in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.