Welcome to DominionMotors.com! Dominion Motors Buick GMC has offered Thunder Bay, Ontario residents the best selection of Buick GMC vehicles for over 100 years and looks forward to continuing in this tradition! We encourage you to stop by our Thunder Bay Buick GMC dealership located at 882 Copper Crescent during our regular business hours, Monday thru Friday 8:30AM to 7:00PM or on Saturdays from 9:00AM to 3:00PM. The Dominion Motors customer care team is ready to assist you will all your needs and is can provide you with the new and used sales assistance, guaranteed financing, Buick GMC service, and parts you've been looking for. more... See more text