Cadillac Certified Service in Thornhill, ON

* Instant tire manufacturer rebates are available when you purchase four (4) identical eligible tires at participating Chevrolet, Buick, GMC and Cadillac dealers in Canada. Instant rebates available: $110 on Bridgestone winter tires, $100 on Michelin winter and non-winter tires, $100 on Pirelli 19” and above and $70 on Pirelli 18” and below tires. $80 on Continental WinterContact TS 830 P, TS 850 P, TS 860 S, and TS 870 P, VikingContact 7 and 8, IceContact XTRM, and TerrainContact AT 2. $80 on Firestone winter tires, $70 on BFGoodrich tires, $60 on Hankook winter tires, $40 on Uniroyal tires, and $40 on General Tire tires. Offer is valid from September 1, 2026 to December 31, 2026. This offer is non-transferable and may not be combined with other offers. Installation and balancing are extra. Limit of 1 instant tire manufacturer rebate per VIN. Conditions and limitations apply. Offer may not apply to tires on all GM models; see participating dealers for details. No rain checks available. This offer may be changed, cancelled or extended at any time without notice. 1 TIRE 30-DAY PRICE MATCH GUARANTEE: Your local dealer will match the competition's prices. If you purchase one of the aftermarket tire brands listed below and later find a competitive price on a qualifying brand within 30 days of the purchase, we’ll refund the difference. Tire Brands: BFGOODRICH, BRIDGESTONE®, CONTINENTAL, FIRESTONE®, GENERAL, GOODYEAR®, HANKOOK, KELLY, MICHELIN, PIRELLI, UNIROYAL, KUMHO, COOPER. The price match applies to the brands listed above. Competitive Prices: The competitive price you find must be in a valid ad, written estimate or Internet quote for identical, new tires. The tires must be an exact match in brand, tire line, size, load rating and speed rating to be eligible for the price match guarantee. All competitive quotes (including internet quotes) must come from a local competing tire retailer and installer (with a physical location within 100km of your participating GM retailer). The competitive price must be valid within 30 days of your purchase of any of the tire brands listed above. Service and Installation: The price match guarantee is only valid on the tire price and does not include installation/labour. Offer available to retail customers only at participating Canadian Chevrolet, Buick, GMC and Cadillac dealers. Offer valid from January 1, 2026 to December 31, 2026. GM Canada reserves the right to cancel, modify or amend the offer without notice. Conditions and limitations apply. May not be combined with other offers and programs.

Roy Foss Certified Service banner advertising a no charge brake inspection, up to $120 instant savings on GM Genuine Parts, brake pads and rotors, an additional $25 savings per axle, a free tumbler with new brake purchase, and a 30-day tire and brake price match guarantee.

Year-Long tire campaign - Cadillac - $150 rebate

* $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 offer. Eligible tires must be purchased at time of delivery of vehicle. Rebate is non-stackable with other Bridgestone consumer offers. Rebate applied before applicable taxes. Offer is subject to tire availability. No rain checks available. This offer may be changed, cancelled or extended at any time without notice. Conditions apply. See participating dealer for details. 1 TIRE 30-DAY PRICE MATCH GUARANTEE: Your local dealer will match the competition's prices. If you purchase one of the aftermarket tire brands listed below and later find a competitive price on a qualifying brand within 30 days of the purchase, we’ll refund the difference. Tire Brands: BFGOODRICH, BRIDGESTONE®, CONTINENTAL, FIRESTONE®, GENERAL, GOODYEAR®, HANKOOK, KELLY, MICHELIN, PIRELLI, UNIROYAL, KUMHO, COOPER. The price match applies to the brands listed above. Competitive Prices: The competitive price you find must be in a valid ad, written estimate or Internet quote for identical, new tires. The tires must be an exact match in brand, tire line, size, load rating and speed rating to be eligible for the price match guarantee. All competitive quotes (including internet quotes) must come from a local competing tire retailer and installer (with a physical location within 100km of your participating GM retailer). The competitive price must be valid within 30 days of your purchase of any of the tire brands listed above. Service and Installation: The price match guarantee is only valid on the tire price and does not include installation/labour. Offer available to retail customers only at participating Canadian Chevrolet, Buick, GMC and Cadillac dealers. Offer valid from January 1, 2026 to December 31, 2026. GM Canada reserves the right to cancel, modify or amend the offer without notice. Conditions and limitations apply. May not be combined with other offers and programs.

Year-Long tire campaign - Cadillac - $100 rebate

* $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 offer. Eligible tires must be purchased at time of delivery of vehicle. Rebate is non-stackable with other Firestone consumer offers. Rebate applied before applicable taxes. Offer is subject to tire availability. No rain checks available. This offer may be changed, cancelled or extended at any time without notice. Conditions apply. See participating dealer for details. 1 TIRE 30-DAY PRICE MATCH GUARANTEE: Your local dealer will match the competition's prices. If you purchase one of the aftermarket tire brands listed below and later find a competitive price on a qualifying brand within 30 days of the purchase, we’ll refund the difference. Tire Brands: BFGOODRICH, BRIDGESTONE®, CONTINENTAL, FIRESTONE®, GENERAL, GOODYEAR®, HANKOOK, KELLY, MICHELIN, PIRELLI, UNIROYAL, KUMHO, COOPER. The price match applies to the brands listed above. Competitive Prices: The competitive price you find must be in a valid ad, written estimate or Internet quote for identical, new tires. The tires must be an exact match in brand, tire line, size, load rating and speed rating to be eligible for the price match guarantee. All competitive quotes (including internet quotes) must come from a local competing tire retailer and installer (with a physical location within 100km of your participating GM retailer). The competitive price must be valid within 30 days of your purchase of any of the tire brands listed above. Service and Installation: The price match guarantee is only valid on the tire price and does not include installation/labour. Offer available to retail customers only at participating Canadian Chevrolet, Buick, GMC and Cadillac dealers. Offer valid from January 1, 2026 to December 31, 2026. GM Canada reserves the right to cancel, modify or amend the offer without notice. Conditions and limitations apply. May not be combined with other offers and programs.

Fall Cadillac Winter Tire Promotion Campaign

*Eligible retail customers who purchase, finance or lease a new retail 2025MY, 2026MY or 2027MY Cadillac OPTIQ, from a participating Ontario Cadillac dealer and, at the time of delivery, purchase a set of (4) four eligible Pirelli winter tires through the GM National Account Tire Program will receive a $300 instant rebate, applied before taxes, on the purchase price of the qualifying tire set. Offer valid from October 1, 2026 to December 31, 2026, on eligible vehicles delivered and eligible tires purchased during that period; tires must be invoiced by December 31, 2026. Eligible vehicles are 2025MY-2027MY Cadillac OPTIQ. Eligible tires are select Pirelli winter tires approved by GM Canada for applicable Cadillac OPTIQ models in eligible sizes and part numbers while quantities last. Offer available only at participating Ontario Cadillac dealers, only on tires purchased through the GM National Account Tire Program, and subject to tire availability. Offer may not be combined with other Pirelli consumer offers, including other GM-exclusive instant tire rebates and Pirelli mail-in rebates. GM Canada reserves the right to change, modify or cancel this offer without notice. Terms & Conditions Apply.

Service Department

Cadillac Certified Service in Thornhill, ON

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Services We Offer in Thornhill

From an oil change to a brake repair, every service below is performed by Cadillac Certified Service technicians using parts engineered for your Cadillac. Choose a service to see what is involved, how often your vehicle needs it, and answers to other frequently asked questions.

Oil Change Tire Service Brake Repair Battery Replacement Wheel Alignment Cabin Air Filter

Why Service at Roy Foss Cadillac Thornhill

Your Cadillac deserves the same precision it was built with, which is exactly what you get with Cadillac Certified Service at Roy Foss Cadillac Thornhill.

A Cadillac Certified Service technician inspecting a brake rotor and caliper at Roy Foss Cadillac 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.
Cadillac Certified Technicians
Factory-trained technicians who know Cadillac engineering in detail, using GM’s own diagnostic tools and equipment.
GM Genuine Parts & ACDelco
Parts engineered for your Cadillac, so fit, performance and refinement 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.

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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 exceptional experience from your Cadillac. Your service experience should be no different. These are the service offers running right now at Roy Foss Cadillac Thornhill. They update themselves from the dealership's own offer feed, so what you see here is what is live today.

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No Charge Brake Inspection
$120 Instant Savings
Offer expires 11/30/2026
Offer disclosure
See dealer for details
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$100 Instant Tire Rebate
Your Winter Tire Destination All Year Long
Offer expires 12/31/2026
Offer disclosure
* Offer applies to select winter tire brands purchased from dealer inventory. Must purchase four (4) in stock winter tires of the same brand/model.  The purchase price before taxes of the four (4) winter tires (excluding installation and labour) will be reduced by an amount equal to the applicable PST/QST/GST/HST. Dealers are free to set individual prices. Offer may not be redeemed for cash and may not be combined with certain other consumer incentives. Offer available to retail customers only. At participating dealers only. Offer ends February 28th, 2026. See dealer for details. Offer is subject to tire availability.  No rain checks available. 1 TIRE 30-DAY PRICE MATCH GUARANTEE: Your local dealer will match the competition's prices. If you purchase one of the aftermarket tire brands listed below and later find a better price on a qualifying brand within 30 days of the purchase, we’ll refund the difference. Tire Brands BFGOODRICH, BRIDGESTONE, CONTINENTAL, DUNLOP, FIRESTONE, GENERAL, GOODYEAR, HANKOOK, KELLY, MICHELIN, PIRELLI, UNIROYAL, KUMHO, COOPER. The price match applies to the brands listed above. Competitive Prices: The competitive price you find must be in a valid ad, written estimate or Internet quote for identical, new tires. The tires must be an exact match in brand, tire line, size, load rating and speed rating to be eligible for the price match guarantee. All competitive quotes (including internet quotes) must come from a local competing tire retailer and installer (with a physical location within 100km of your participating GM retailer). The competitive price must be valid within 30 days of your purchase of any of the tire brands listed above. Service and Installation: The price match guarantee is only valid on the tire price and does not include installation/labour. Offer available to retail customers only at participating Canadian Chevrolet, Buick, GMC and Cadillac dealers. Offer valid from January 1, 2026 to December 31, 2026. GM Canada reserves the right to cancel, modify or amend the offer without notice. Conditions and limitations apply. May not be combined with other offers and programs.
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$150 Instant Tire Rebate
Your Winter Tire Destination All Year Long
Offer expires 12/31/2026
Offer disclosure
* Offer applies to select winter tire brands purchased from dealer inventory. Must purchase four (4) in stock winter tires of the same brand/model.  The purchase price before taxes of the four (4) winter tires (excluding installation and labour) will be reduced by an amount equal to the applicable PST/QST/GST/HST. Dealers are free to set individual prices. Offer may not be redeemed for cash and may not be combined with certain other consumer incentives. Offer available to retail customers only. At participating dealers only. Offer ends February 28th, 2026. See dealer for details. Offer is subject to tire availability.  No rain checks available. 1 TIRE 30-DAY PRICE MATCH GUARANTEE: Your local dealer will match the competition's prices. If you purchase one of the aftermarket tire brands listed below and later find a better price on a qualifying brand within 30 days of the purchase, we’ll refund the difference. Tire Brands BFGOODRICH, BRIDGESTONE, CONTINENTAL, DUNLOP, FIRESTONE, GENERAL, GOODYEAR, HANKOOK, KELLY, MICHELIN, PIRELLI, UNIROYAL, KUMHO, COOPER. The price match applies to the brands listed above. Competitive Prices: The competitive price you find must be in a valid ad, written estimate or Internet quote for identical, new tires. The tires must be an exact match in brand, tire line, size, load rating and speed rating to be eligible for the price match guarantee. All competitive quotes (including internet quotes) must come from a local competing tire retailer and installer (with a physical location within 100km of your participating GM retailer). The competitive price must be valid within 30 days of your purchase of any of the tire brands listed above. Service and Installation: The price match guarantee is only valid on the tire price and does not include installation/labour. Offer available to retail customers only at participating Canadian Chevrolet, Buick, GMC and Cadillac dealers. Offer valid from January 1, 2026 to December 31, 2026. GM Canada reserves the right to cancel, modify or amend the offer without notice. Conditions and limitations apply. May not be combined with other offers and programs.
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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.
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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.
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Book Your Service Appointment

Choose your services and pick a time that works for you.

A Cadillac Certified Service technician fitting a wheel to a Cadillac at Roy Foss Cadillac Thornhill

Cadillac Certified Service, Parts & Tires in Thornhill

The service centre at Roy Foss Cadillac Thornhill is staffed by Cadillac Certified Service technicians who are factory trained on Cadillac vehicles. They use GM Genuine Parts and ACDelco, and a trusted GTA Cadillac dealer since 1962 stands behind the work. We serve drivers across Thornhill, North York, Richmond Hill and Markham from 7200 Yonge Street.

Routine maintenance is easy to book: oil changes, battery replacement, tire service and cabin air filter replacement, with a shuttle to home or work and an updated waiting lounge 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.

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Service Department FAQs

A Cadillac Certified Service technician torquing the wheel of a Cadillac with an impact wrench at Roy Foss Cadillac Thornhill

How do I book a service appointment at Roy Foss Cadillac Thornhill?

Book online through our schedule service form, or call the service department at (905) 886-2009. Booking ahead means the right parts and a Cadillac Certified technician are ready for your vehicle when you arrive.

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.

Are your technicians Cadillac certified?

Yes. Our Cadillac Certified Service technicians are factory trained on Cadillac vehicles and use GM's own diagnostic equipment. We fit GM Genuine Parts and ACDelco, from routine maintenance through to major repairs.

Which services can I book here?

The work we are asked for most has a page of its own: oil changes, brake repair, tire service, battery replacement, wheel alignment and cabin air filter replacement. Each one explains the service, the warning signs and the intervals Cadillac recommends.

How do I know what service my Cadillac is due for?

Your Cadillac'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 explore the latest Cadillac 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