Colorado Fleetworks
“Mike is willing to go over and above the call of duty, I'm quite please with this business as I'm a business owner myself… time is money !”
Best Engine Repair & Rebuild in Commerce City, CO
15 technicians listed · 9 in Commerce City · 6 open weekends · 13 rated 4.5+
Data verified October 16, 2026
Marini Diesel Inc.
“They know what they are doing when it comes to Cummins engine.”
Expert Motors
“I took my 2014 Mercedes E63 S AMG , it was leaking Coolant , no one knew what's the problem , Abdull found the problem and they fixed it professionally , I recommend this place , keep it up”
Park Hill Motors
“Helped me through a very rough process getting my front suspension fixed/replaced.”
JM Diesel Repair
“The GO TO place for Diagnostics and Repairs on class 8 trucks”
Eddie's Engine Service
“There the best never seen a disel shop that's on the costumers side this is the one where costumer are first”
Listed for drivers in and around Commerce City, 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: Commerce City, CO
9 of the 15 technicians we list are based in Commerce City; the other 6 serve Commerce City from towns including Denver (7 mi), Arvada (16 mi) and Aurora (12 mi). The technicians on this page are rated from 4.3 to 5.0 across 1,881 reviews; 10 have 50 or more reviews and 13 are rated 4.5 or higher. When customers rate these technicians on specific qualities, they most often praise professionalism (93%), quality (90%) and value (77%). The topics that come up most in reviews of the technicians on this page are "diagnosis", "honest" and "communication". 6 are open on Saturdays. The services the technicians on this page list most often on their websites are oil changes (2), pre-purchase inspections (2) and transmission services (2). 3 list staff certifications (ASE) and 7 have a BBB rating of A or A+. Domain records put 8 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; 2 offer financing; 6 are family- or locally-owned and 3 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?
9 of the 15 shops are in Commerce City itself and the rest come from other towns within 20 mi. An engine job means leaving the car for days, so the drive happens once at each end rather than every morning.
El 27
“I bought and they themselves installed the engine in my Gmc Savana, that was approximately 2 years ago and the engine works wonderfully without problems, I highly recommend them, very good prices and very professional”
CGC Diesel & Truck
Itscam Llc Diesel Mechanic
“I have two trucks and if I ever need them to be work on, this is the mechanic I trust.”
Aurora Autopros
“They took care of my car expeditiously and the guys are super friendly..”
Accountable Auto Care
“Would definitely recommend them for your automotive repair needs.”
Motorized Solutions
“I take my car here for its maintenance and they're always friendly and fair.”
Colorado Engine
“Colorado Engine has always completed my vehicle maintenance quickly, I trust them to provide a very fair price for parts and labor.”
Salta Service & Performance
“Best place for Audi and VW work in Denver!”
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Arvada Motorsports
“Was able to stop in and drop off my Porsche for a quick oil change.”
Why these companies made our list
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