Lupe's Auto
“I took the car for a spin I had a doctor's appointment today went down the freeway car seems to have more power everything is fine very happy you guy's did a fantastic job thank you”
Best Engine Repair & Rebuild in Ontario, CA
15 technicians listed · all 15 in Ontario · 6 open weekends · 12 rated 4.5+
Data verified October 16, 2026
Wayne's Automotive
“Jim has been taking care of my family's cars for over 15 years.”
Tap Automotive
“I had an issue with my car and the mechanic, Martin, helped me resolve my problem.”
Kar King Auto
“After an exhaustive search for a built engine, I found the one and only, professionals!”
C & C Automotive
“Excellent service, very good customer service, quality service, I recommend you as a mechanic, I will continue to take my vehicles to this place.”
C & T Japanese Engines Inc
“I have been buying engines and transmissions here for 15 years and they have turned out very good.”
Listed for drivers in and around Ontario, CA, 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: Ontario, CA
All 15 technicians we list here are in Ontario itself. We have 16 technicians in Ontario on file; this page shows the highest-rated 15. 14 of the technicians on this page have a rating, from 4.1 to 5.0 across 1,044 reviews; 4 have 50 or more reviews and 12 are rated 4.5 or higher. 6 are open on Saturdays. 5 have a BBB rating of A or A+. Domain records put 5 websites of the technicians on this page at ten or more years old; the oldest dates from 2000. 2 give free estimates. 1 has Spanish-speaking staff. We have a website on file for 10 of the technicians on this page; 5 publish a contact page; 4 list a public email and 1 takes bookings online. We count these figures across the technicians on this page; hours and prices change, so confirm the details with the technician before you visit.
Speedway Transmissions
“They do fantastic work, are as honest as the day is long, and stand by their work 100%.”
JB Euro Repair
“I appreciate the help & information he provided to me regarding my vehicle and the attention him & his team provided to all issues that my car had.”
Done Right Diesel
“Very good technician ,martin always here to help good price , very good experience,I strongly recommended”
Caliber Diesel
“Very welcoming, they did a pressure test and checked for cracks while we waited because we needed that info to know if we needed to buy a new head.”
Team Green Motor Sports LLC
“All I can say is trust Danny will get the job done ✅ 👍👍👍👍”
Rivera-Vega Mechanic
“Very happy satisfied with the result of the work very good mechanic”
Express Motor Swaps
“Engine swaps are not cheap (but much less than buying a new car) total time was 3 weeks to get it done but definitely worth the wait and cost”
Revolution Engines & Performance
Rebuilt 08-12 Nissan Xterra 4.0L V6 Vq40de Engine
Why these companies made our list
Is this page useful? Yes
No
Is there anything wrong with this page?
