2017 Cadillac CT6 3.6L. CARFAX One-Owner. 2017 Cadillac CT6 3.6L Black Raven AWD 8-Speed Automatic 3.6L V6 SIDI DOHC VVT 18/27 City/Highway MPG Reviews: * Plenty of rear passenger space for adults; engaging driving experience for a large luxury sedan; V6 engines are... via AutoRevolution