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Weldon Spring Automotive
“In the past 15 years of going here I have never heard them tell a customer a lie or try to sell something that isn't needed.”
Best Engine Repair & Rebuild in St. Charles, MO
15 technicians listed · 10 in St. Charles · 3 open weekends · 13 rated 4.5+ · 1 shows a license
Data verified October 19, 2026
Sparks Tire & Auto
“The guys in the office are super friendly and even gave me a lift home as they had my only mode of transportation.”
Coffey Automotive
“They have been clear up front with the work that is needed and their estimates come in on point!”
Aamco Transmissions & Total Car Care
“I've been going to Aamco for many years and have always had a good experience.”
Phalanx Performance LLC
“Up front honest business run by a true car enthusiast and will go above n beyond!”
Kar Tech
“The mechanics were honest with me about whether I should put money into this vehicle or put it towards buying a new one.”
Listed for drivers in and around St. Charles, MO, 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: St. Charles, MO
10 of the 15 technicians we list are based in St. Charles; the other 5 serve St. Charles from towns including St. Louis (18 mi), St. Peters (5 mi) and Hazelwood (9 mi). The technicians on this page are rated from 4.3 to 4.9 across 2,591 reviews; 13 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 quality (88%), professionalism (85%) and value (76%). The topics that come up most in reviews of the technicians on this page are "diagnosis", "honest" and "fair". 3 are open on Saturdays. 1 shows a license on its website; 3 list staff certifications (ASE) and 6 have a BBB rating of A or A+. Domain records put 11 websites of the technicians on this page at ten or more years old; the oldest dates from 2007. 5 offer financing; 7 are family- or locally-owned and 8 list coupons or special offers. We have a website on file for 14 of the technicians on this page; 11 publish a contact page; 1 lists a public email and 3 take bookings online. 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?
10 of the 15 shops are in St. Charles 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.
Nocturnal Motorworks
“He is always fair with his pricing and will go out of his way to work with you, nobody else work on my cars but him!”
Lunds Engine
“Really helped me out in a bind got a flywheel done in a day when nobody else was even open.”
LPS Motorwerks
“As a customer who likes getting into details of the cars and any entailed work, I really appreciate that extra mile they go explaining it to me.”
Waterson Motorsports
“He is like a nice, personable scientist when it comes to cars.”
Western Tire & Auto
“As always, very professional and nice .”
Greg's Auto Service and Repair
“You won't feel ripped off for the work.”
Hillside Auto Repair
“I took my 1979 Jeep CJ5 Renegade to Hillside Auto Repair as they were the only shop in the area who listened and addressed all my concerns.”
Certified Transmission & Auto Repair
“I really want to let all my female reviewers to know that this is one auto shop,that you will be in good hands going to.”
Aamco Transmissions & Total Car Care
“I had very professional work done on my Chevy Trailblazer…very quick work.”
Why these companies made our list
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