LaCrosse Premium I Group, Black Onyx, Brandy w/Ebony Accents w/Perforated Leather-Appointed Seat Trim. CARFAX One-Owner. Clean CARFAX. Odometer is 32211 miles below market average! Black Onyx 2017 Buick LaCrosse Premium I Group FWD 8-Speed Automatic 3.6L V6 DI 21/31... via vAuto, Inc.