Centerway Auto Repair Inc
“I tell everyone I meet that needs a reliable mechanic to hit up centerway auto in janesville.”
Best Engine Repair & Rebuild in Janesville, WI
10 technicians listed · 4 in Janesville · all 10 rated 4.5+
Data verified October 20, 2026
Rock Diesel
“I was able to “limp” my rig to them and Chris was immediately able to diagnose the broken wire in a wiring harness, and get us back on the road within 3 1/2 hours.”
ALS Diesel Inc.
“ALS is not the cheapest shop, but I can tell you I would trust no one else to work on my truck!”
C.P. Motorworks
“In a day and age where it's hard to find the good ones, without a shadow of a doubt, Pete is the premium vintage and performance engine builder in Wisconsin.”
High Velocity Diesel Performance
“They are very professional, I had an up pipe replaced and a few other things, they kept me updated on progress and made sure everything was completed the right way.”
Drivelines Automotive
“They test drove the car, ran a computer check, and everything seemed fine, so they cleared us to continue our trip back home without having to pay the evaluation fee (which I had already agreed to).”
Listed for drivers in and around Janesville, WI, these 10 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: Janesville, WI
4 of the 10 technicians we list are based in Janesville; the other 6 serve Janesville from towns including Edgerton (11 mi), Brodhead (20 mi) and Footville (10 mi). The technicians on this page are rated from 4.5 to 5.0 across 645 reviews; 3 have 50 or more reviews. 2 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 2005. 1 gives free estimates. We have a website on file for 8 of the technicians on this page; 6 publish a contact page; 2 list a public email and 1 takes 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?
4 of the 10 shops are in Janesville itself and the rest come from other towns within 25 mi. An engine job means leaving the car for days, so the drive happens once at each end rather than every morning.
Cmg Automotive
“Ryan will always go the extra mile for his customers and offers affordable repairs and maintenance.”
Fast Eddie's Auto&small Engine Repairs
“He came to check my check engine light and fixed all my issues in my car.”
Arn's Auto Service
“The following Monday they got it looked at had an idea of what it needed and had it back to us on Tuesday.”
Systech Automotive (Formerly Kubly's)
“Tracy is always friendly on the phone or in person and is quick to answer questions or explain what the technician has done or found.”
Why these companies made our list
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