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Best Auto Repair Longmont
Best of Longmont Award-winning service since 2014 and trusted by Longmont drivers.
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Customer Service
Friendly, professional staff dedicated to keeping you safely on the road.
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Complete Auto Care
From oil changes to major repairs, we handle all your car’s needs.
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21+ Years in Business
Proudly serving Longmont since 2004 with honest, experienced, and reliable auto care.
About Stonum Automotive
Stonum Automotive – Longmont’s Trusted Auto Repair Service
At Stonum Automotive, we provide expert auto repair, maintenance services, and complete vehicle care to keep your car running smoothly. Since 2004, we’ve been Longmont’s trusted auto repair shop, offering everything from oil changes and brake repairs to engine diagnostics and transmission services—all at competitive prices. Whether you need routine auto maintenance in Longmont or major repairs, our trained mechanics are here to help. We make car care easy and stress-free so you can stay on the road with confidence. Read More About Us
Call: +303-485-9303
Auto Mechanic
Expert Automotive Services You Can Trust
From routine maintenance to complex repairs, our ASE-certified technicians provide dependable auto care you can count on. At Stonum Automotive, we’re dedicated to keeping your vehicle running safely, efficiently, and smoothly—so you can stay confident on the road ahead. » Auto Repair Services
Air Conditioning Service
From diagnostics to repairs, we ensure your vehicle’s climate control works when you need it.
Oil Change Service
Full-service oil changes with premium oils, filter replacement, and a multi-point inspection.
Engine Maintenance
Comprehensive engine maintenance to maximize performance, efficiency, and longevity.
Brake Service
From squeaks to slow stopping, we diagnose and fix brake issues before they become dangerous.
Maintenance Services
Comprehensive maintenance to extend vehicle life, improve performance and prevent costly reparis.
Fleet Vehicle Service
Expert care for fleets of all sizes, from routine maintenance to complex repairs.
Great service and work. Work is always done well the first time and never requires return visit. Customer service is courteous and they answer any questions I may have in a clear manner. Stoning is always my first choice for auto maintenance and repairs.
Stonum is the best shop I have used in many years. I have referred several friends to Stonum and each time they have shown how much they care about doing good work and caring for each customer’s situation.
Recent Auto Repair News and Information
What Is Wheel Alignment & Why Is a Must?: Ensuring Smooth Drives in Longmont, CO
Your car seems to have a sense of direction of its own lately. You notice it drifting slightly to one side as if trying to hug the curb at every chance. Many drivers notice these issues but don't always realize the impact they can have on their vehicle's performance...
Winter Car Care Checklist: How to Keep Your Vehicle Running Smoothly in Cold Weather
According to the Federal Highway Administration, over 150,000 accidents occur on icy roads yearly. Anything from poor traction to frozen engine fluid can make your car a hazard on the road. Plus, the last thing you want is to stall in the middle of a blizzard! Ensure...
The Importance of Winter Tires: When and Why to Make the Switch
According to the USDOT Federal Highway Administration, black ice contributes to over 1,800 deaths and over 136,000 injuries annually on icy roads. In fact, drivers are 3.6% more likely to get into fatal crashes during winter on black ice than other weather hazards....