- 2018–2019 Factory-verified
premium paint; 2018: 1SV, 1SP only; 2019: not on 1SH; the 2018 guide prints Darkmoon
GDX Factory-verified
Also described as Dark Moon Blue Metallic
Documented applications
- 2019 Factory-verified
2019: premium paint; not on Regal or GS (2019 Sportback order guide)
This page aggregates every documented appearance of GDX in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.