Ebony Twilight Metallic 2019 Buick Enclave Avenir AWD 9-Speed Automatic 3.6L V6 SIDI VVT AWD. The Montrose Promise 1. Price Promise â We'll beat anybody's price! Everyday. Every vehicle. No exceptions! 3. Satisfaction Guarantee Promise â If you are not completely satisfied, you can exchange any vehicle for any reason within 2 days or 150 miles. 4. Service Promise â FREE first oil change, anytime exterior car wash, anytime multi-point inspection with any service visit, vehicle appraisal report with any service visit, and battery installation! 5. Warranty Promise â UNLIMITED mileage powertrain warranty for 1 year on select pre-owned vehicles! 6. Credit Promise â You've got a friend for finance with our Montrose EZ Credit Program...100 credit approval is our goal! Donât forget to ask us about The Montrose HERO Promise! Recent Arrival! Odometer is 14887 miles below market average!