Diesel Repair & Performance Service in Wilmington, OH
Honest diesel work for the farms, fleets, and work trucks that keep Clinton County moving — engine repair, heavy duty service, and farm equipment from County Line Diesel Performance in nearby Harveysburg.
Clinton County's Diesel Shop.
Wilmington runs on diesel. Farm trucks pulling grain wagons, work pickups headed to job sites, semi tractors out of the Air Park, and equipment turning the fields that surround town — it all needs somebody who knows what they're doing when something goes wrong.
County Line Diesel Performance is right next door in Harveysburg, less than 20 minutes from downtown Wilmington. That means real diesel service without the drive to Dayton or Cincinnati. Pickup trucks, medium and heavy-duty rigs, farm equipment, heavy machinery — we handle all of it for Wilmington and the rest of Clinton County.
Full-Service Diesel Work.
From a Cummins that won't start to a combine that needs to be running by harvest — same shop, same standards.
Engine Repair & Rebuilds
Injector replacement, head gaskets, full engine rebuilds, diagnostic work. Real diagnosis, honest repairs, parts that last.
Heavy Duty Trucks
Class 6, 7, and 8 truck repair, DOT inspections, brakes, drivetrain — for Wilmington's commercial drivers and small fleets.
Farm & Heavy Equipment
Tractors, combines, skid steers, excavators. On-site service available for equipment that can't come to the shop.
Performance & Tuning
Custom tuning, programmers, deletes, and full power builds for Cummins, Power Stroke, and Duramax pickup trucks.
The Diesel Shop Around The Corner.
Dealerships book out weeks. Big chains charge big chain prices. Here's what makes the drive over to Harveysburg worth it.
Owner Operated
You talk to the person turning the wrench. Not a service advisor reading from a script.
Diesel Specialist
This is a diesel shop, not a general repair shop that also does diesel. We see it every day, we fix it every day.
Straight Prices
Real estimates before work starts. No bait-and-switch, no "while we were in there" surprises.
Fast Turnaround
Working trucks get prioritized. We know what downtime costs Wilmington's drivers and we work accordingly.
Wilmington Questions.
Things folks from Clinton County tend to ask. Anything else, just call the shop.
How far is your shop from Wilmington?
About 20 minutes — we're in Harveysburg at 10007 Old State Highway 73, easy run up SR-73 or down 134. Easy drop-off and pick-up for most folks in Clinton County.
Do you come out to farms in Clinton County?
For farm and heavy equipment that can't easily come to the shop, yes — on-site service is available throughout the four-county area. Best to call ahead so we can plan the timing right.
Do you work on the trucks running out of the Air Park area?
Yes — Class 6, 7, and 8 commercial truck work is one of our core services. DOT inspections, engine work, brakes, and drivetrain repairs for the over-the-road and regional rigs running through Clinton County.
What hours are you open?
Monday through Saturday, 8 AM to 6 PM. Call ahead for emergency or after-hours work — we'll do what we can to help.