GM Certified Service in Thornhill, ON
Service Department
GM Certified Service in Thornhill, ON
Services We Offer in Thornhill
From an oil change to a brake repair, every job below is carried out by GM-trained technicians using parts made for your vehicle. Choose a service to see what is involved, how often your vehicle needs it, and answers to other frequently asked questions.
Why Service at Roy Foss Thornhill
Your vehicle deserves the best care and attention available, which is exactly what you get with Certified Service from Roy Foss Chevrolet Buick GMC Thornhill.
Included with your service
6 Months Free Roadside Assistance + Engine for Life
Every oil change comes with six months of complimentary roadside assistance and Engine for Life coverage.
Video Vehicle Inspections
See exactly what your technician sees, in a short video of your inspection sent straight to your phone.
GM-Trained Technicians
Technicians trained specifically on Chevrolet, Buick, GMC and Cadillac vehicles, using GM’s own diagnostic tools.
GM Genuine Parts & ACDelco
Parts engineered for your vehicle, so fit, performance and reliability are never compromised.
Shuttle Service
Service shouldn’t disrupt your day. We’ll get you to work, home or wherever you need to go.
Seasonal Tire Storage
Leave your off-season set with us. We store your tires between changeovers, so there is nothing to haul home or find room for.
- Tire Price Match
30-day price match on every set of tires - Senior’s Day Tuesdays
10% off repairs for drivers 65+ - High Mileage Club
Up to 20% off parts and labour past 100,000 km
Ask your service advisor for full details about roadside assistance and Engine for Life coverage, including eligibility, maintenance requirements and coverage limits.
Current Service Offers
You expect an unmatched level of excellence from your driving experience. Why expect less from your service experience? These are the service offers running right now at Roy Foss Chevrolet Buick GMC Thornhill. They update themselves from the dealership's own offer feed, so what you see here is what is live today.
There are no service offers running today. Call our service advisors at (905) 886-2009 and we will let you know what is coming up.
$150 Winter Tire Rebate
Your Winter Tire Destination All Year Long
Offer expires 12/31/2026
Offer disclosure
* $150 instant rebate on the purchase of a set (4 tires) of Bridgestone Blizzak winter tires when you purchase, finance or lease an eligible 2024-2027 GM vehicle between January 3, 2026 to December 31, 2026. New retail vehicles only; purchase, finance or lease of used, certified pre-owned or fleet vehicles not eligible for off er. Eligible tires must be purchased at time of delivery of vehicle. Rebate is non-stackable with other Bridgestone consumer off ers. Rebate applied before applicable taxes. Off er is subject to tire availability. No rain checks available. This off er may be changed, cancelled or extended at any time without notice. Conditions apply. See participating dealer for details.
$100 Tire Instant Rebate
Your Winter Tire Destination All Year Long
Offer expires 12/31/2026
Offer disclosure
* $100 instant rebate on the purchase of a set (4 tires) of Firestone WinterForce winter tires when you purchase, finance or lease an eligible certified pre-owned GM vehicle between January 3, 2026 to December 31, 2026. Certified pre-owned vehicles only, purchase, finance or lease of fleet vehicles not eligible for off er. Eligible tires must be purchased at time of delivery of vehicle. Rebate is non-stackable with other Firestone consumer off ers. Rebate applied before applicable taxes. Off er is subject to tire availability. No rain checks available. This off er may be changed, cancelled or extended at any time without notice. Conditions apply. See participating dealer for details.
High Mileage Club
Over 100,000 km? The more you drive, the more you save on parts and labour: 10% off at 100,000 km, 15% at 150,000 and 20% at 200,000.
Offer disclosure
See Roy Foss for details.
Senior's Day Every Tuesday
Receive 10% off service at Roy Foss! Contact us for details
Offer disclosure
Senior’s Day offer applies to customers who are aged 65+. Discount is not eligible for maintenance menu items. Valid for repairs only. All offers cannot be used on past purchases, cannot be redeemed for cash, and may not be combined with certain other offers. Please contact Roy Foss for all offer details.
GM Certified Service, Parts & Tires in Thornhill
The service centre at Roy Foss Chevrolet Buick GMC Thornhill is run by GM Certified technicians trained on Chevrolet, Buick, GMC and Cadillac vehicles. They use GM Genuine Parts and ACDelco, with options to suit any budget, and a trusted GTA GM dealer since 1962 stands behind the work. We serve drivers across Thornhill, North York, Richmond Hill and Markham from 7200 Yonge Street.
Everyday maintenance moves quickly through our GM Express Lane: oil changes, battery replacement and new wiper blades, with a shuttle to home or work and updated waiting lounges if you would rather stay. Not sure what is due? Check the maintenance schedule for your model or book a vehicle health check.
Our parts team can order genuine GM parts, build a winter tire and wheel package, help you shop tires or price brake pads and rotors before you book the work in. Current offers are on our service specials page, and our hours and directions are a click away.
Book Your Service Appointment
Choose your services and pick a time that works for you.
Service Department FAQs
How do I book a service appointment at Roy Foss Thornhill?
Book online through our schedule service form, or call the service department at (905) 886-2009. Express service for oil changes, battery replacement and wiper blades does not need an appointment, but booking ahead will get you in and out faster.
What are your service department hours?
Service and parts are open Monday to Friday, 8:00 AM to 5:00 PM, and Saturday, 8:00 AM to 1:00 PM. We are closed Sundays. Full store hours and directions are on our hours and directions page.
Do you service Cadillac vehicles as well?
Yes. Our Certified Service technicians are trained on Chevrolet, Buick, GMC and Cadillac vehicles, and we stock parts for all four, from ACDelco through to original equipment.
Which services can I book here?
The work we are asked for most has a page of its own: oil changes, brake repair, tire services, battery replacement, wheel alignment and cabin air filter replacement. Each one explains the service, the warning signs and the intervals GM recommends.
How do I know what service my vehicle is due for?
Your vehicle's oil life monitor and Driver Information Centre will flag most items. For the full picture, check the maintenance schedule for your model, or book a vehicle health check and we will go through it with you.
What do current service offers cover?
Offers change through the year and often cover tires, brakes and seasonal maintenance. Everything running today is in the carousel and the offer grid on this page, and the full list with disclaimers is on our service specials page.
Do you offer a shuttle or a waiting area?
Both. We run a shuttle to home or work, and our waiting lounges were recently updated. You are welcome to have a look at the latest Chevrolet, Buick and GMC models while you wait.
Can I buy tires and parts without booking service?
Yes. You can shop tires, price a winter tire package or order parts directly, and our parts team on (905) 886-2047 can quote you before anything is booked in.
Didn't find the answer you are looking for? Contact service (905) 886-2009
