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
Hillside Auto Repair
Western Tire & Auto
Aamco Transmissions & Total Car Care
Phalanx Performance LLC
Kar Tech
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.