Best Engine Repair & Rebuild near O'Fallon, MO

1 of these technicians is based in O'Fallon; the others serve O'Fallon from towns including St. Charles (11 mi), Wentzville (6 mi) and Lake St Louis (2 mi).

4 open weekends · 13 rated 4.5+

Data verified October 19, 2026

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Weldon Spring Automotive

Weldon Spring Automotive

4.8 48 reviews
“The polite and competent staff are honest about the work that needs done and always do a solid job.”
Coupons & offers24-mo/24k-mi warrantyASE-certified techsSince 2000BBB A+Family-owned
Saint Charles, MO · 11 mi from O'Fallon
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Hillside Auto Repair

Hillside Auto Repair

4.6 46 reviews
“This is a great company that truly cares about helping others and is very well versed in dealing with warranty companies, which can be a pain.”
Coupons & offers36-mo/36k-mi warrantyFinancing availableBBB accreditedSince 1988
400 Church St
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Western Tire & Auto

Western Tire & Auto

4.7 47 reviews
“Always helpful, professional, and we take alk 4 of our vehicles to him… along with our kids vehicles.”
Coupons & offersBBB ASince 1997Family-ownedFinancing
Saint Peters, MO · 6 mi from O'Fallon
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Aamco Transmissions & Total Car Care

Aamco Transmissions & Total Car Care

4.6 46 reviews
“Worked hard to find someone who could build a part that was unavailable.”
10% off, maximum $50Missouri inspection stationFinancing availableFleet accountsSince 2012Locally owned
Saint Charles, MO · 11 mi from O'Fallon
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Phalanx Performance LLC

Phalanx Performance LLC

4.8 47 reviews
“This shop is honest, reputable and a great part of the rotary and car community as a whole.”
Since 2018Prices online
Saint Charles, MO · 11 mi from O'Fallon
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Kar Tech

Kar Tech

4.9 49 reviews
“An amazing mechanic, Randy saved me almost $3,000 on a quote from my dealership to replace my exhaust.”
Since 1993Family-owned
Saint Charles, MO · 11 mi from O'Fallon
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Listed for drivers in and around O'Fallon, 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: O'Fallon, MO

The 15 technicians on this page are rated from 4.3 to 5.0 across 1,392 reviews; 8 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 (91%), professionalism (86%) and value (82%). The topics that come up most in reviews of the technicians on this page are "honest" and "diagnosis". 4 are open on Saturdays and 1 on Sundays. 3 have a BBB rating of A or A+. 8 have ten or more years of experience, the longest 38 years. 3 offer financing; 1 gives free estimates; 6 are family- or locally-owned and 6 list coupons or special offers. We have a website on file for 10 of the technicians on this page; 7 publish a contact page; 1 lists a public email and 4 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.

Do engine shops listed for O'Fallon let me spread the cost?

3 of the 15 shops on this page state that they offer financing. An engine is the repair people borrow for, so compare what the credit costs against what a different car would cost you, and get the repair quote in writing first.

The Garage

The Garage

4.8 49 reviews
“If you've not had the pleasure of experiencing their outstanding service I highly recommend stopping in the next time you need something for your vehicle!”
Since 1999
Wentzville, MO · 6 mi from O'Fallon
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Honest Affordable Auto Repair

Honest Affordable Auto Repair

4.9 49 reviews
“I took my vehicle in on Monday & was back on the road by end of day Tuesday.”
Since 2015
Saint Peters, MO · 6 mi from O'Fallon
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LPS Motorwerks

LPS Motorwerks

4.8 30 reviews
“Took my Porsche boxster in for a new oil separator, and when I got it back it's running as strong as ever.”
Coupons & offersSince 2006
Saint Charles, MO · 11 mi from O'Fallon
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Jason Walters Motorsports

Jason Walters Motorsports

5.0 19 reviews
“He was able to get me in the next morning after I called, had great communication, and had my car done the day after I dropped it off and that was because he had to wait on parts.”
Free estimatesSince 2023Family-owned
Lake St Louis, MO · 2 mi from O'Fallon
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Century Dodge Chrysler Jeep RAM Service Center

Century Dodge Chrysler Jeep RAM Service Center

4.4 6 reviews
“Bow has been keeping me updated on everything that we have been working on getting the car running smoothly and getting rid of all the problems that keep popping up.”
Coupons & offersSince 2011Family-ownedFinancing
Wentzville, MO · 6 mi from O'Fallon
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Waterson Motorsports

Waterson Motorsports

4.5 23 reviews
“Always comes through with the work and pricing is very good!”
Saint Charles, MO · 11 mi from O'Fallon
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Cartech Automotive

Cartech Automotive

5.0 20 reviews
“He does excellent work and has the most reasonable prices you will find anywhere!”
Lake St Louis, MO · 2 mi from O'Fallon
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Precision Engine Rebuilders

Precision Engine Rebuilders

4.4 13 reviews
“Had them reman my jeeps crankshaft, press in some bearings and bore out the short block.”
Wentzville, MO · 6 mi from O'Fallon
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Wies Equipment Repair LLC

Wies Equipment Repair LLC

4.7 11 reviews
“Had me in and out in no time and gave me some helpful advice as how to keep my Cummins in tip top shape.”
Weldon Spring, MO · 5 mi from O'Fallon
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Why these companies made our list

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