Alternative Auto Care
“I recently had my Element serviced, It was easy and convenient to make my appointment.”
Best Engine Repair & Rebuild in Thornton, CO
15 technicians listed · 5 in Thornton · 4 open weekends · 13 rated 4.5+
Data verified October 16, 2026
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Front Range Motors
“I really liked the idea one of the technician got in car with me and drove around the block to hear the sound I was hearing when I start the car, and continues when driving.”
Service Street Auto Repair
“Car was having cut out during WOT, they got it under control same day.”
Jones Diesel
“He's fast, efficient and overall I had an amazing experience.”
Foreign Car Specialist
Colorado Fleetworks
“Did great work, Mike is a great guy!”
Listed for drivers in and around Thornton, CO, these 15 shops repair, rebuild and replace engines. What each one says about machine work, warranty terms and the engines it supplies comes from its own website; ratings and quotes come from public reviews.
Area overview: Thornton, CO
5 of the 15 technicians we list are based in Thornton; the other 10 serve Thornton from towns including Arvada (13 mi), Broomfield (6 mi) and Denver (11 mi). The technicians on this page are rated from 4.0 to 5.0 across 5,069 reviews; 13 have 50 or more reviews and 13 are rated 4.5 or higher. The topics that come up most in reviews of the technicians on this page are "diagnosis", "honest" and "communication". 4 are open on Saturdays and 1 on Sundays. The services the technicians on this page list most often on their websites are oil changes (4), brake repair (2), brake services (2), brakes (2) and diagnostics (2). 7 list staff certifications (ASE) and 11 have a BBB rating of A or A+. Domain records put 10 websites of the technicians on this page at ten or more years old; the oldest dates from 2001. 1 offers emergency or roadside call-outs; 3 offer financing; 6 are family- or locally-owned and 8 list coupons or special offers. We count these figures across the technicians on this page; distances are straight-line, and hours and prices change, so confirm the details with the technician before you visit.
Why do some listings show another city?
5 of the 15 shops are in Thornton itself and the rest come from other towns within 15 mi. An engine job means leaving the car for days, so the drive happens once at each end rather than every morning.
Arvada Automotive Center
“Camerom assured me i can drive safely , that its probably the thermostat and didnt even chargeto look at it.”
Motorized Solutions
“I will definitely refer my friends and family.”
Accountable Auto Care
“Provided several solutions and recommendations with honest pricing.”
Colorado Engine
“Always great to have Colorado Engine to work on my vehicle!”
Salta Service & Performance
“They inspected the vehicle's suspension, brake system, and other parts; and pointed out things that I overlooked that will need replacing soon.”
Fine Tuned Auto
“Great vehicleservice and customer service is great!”
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Arvada Motorsports
“These guys are always helpful when called upon!”
Bending Wrenches Auto Repair
“These guys did a great job and they're very personable”
5th Gear Automotive
“These guys honest, do good work friendly highly recommend”
Why these companies made our list
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