Diesel Performance & Repair in Harveysburg, OH
Expert diesel service for pickup trucks, medium and heavy-duty rigs, farm equipment, and heavy machinery — across Warren, Clinton, Greene & Montgomery counties.
Built On Wrenches. Run On Reputation.
County Line Diesel Performance was started by Jake Patrick — 30 years old and turning wrenches as long as he can remember. From pickup trucks to medium and heavy-duty rigs, to farm and heavy equipment, there isn't much in the diesel world he hasn't had his hands on.
The shop was built to do one thing right: keep working trucks and machines moving for the people who depend on them. No corporate scripts, no middleman, no upselling. Just honest diesel work done right the first time.
Diesel Work, Front To Back.
Whether it's your daily driver, the rig that pays your bills, or the equipment running your operation — we handle every aspect of the diesel industry under one roof.
Diesel Performance & Tuning
Custom tuning, performance upgrades, deletes, and power builds for Cummins, Power Stroke, and Duramax. Built for the road or built for work — your call.
Learn MoreEngine Repair & Rebuilds
From injector swaps to head gaskets to full engine rebuilds. We diagnose the actual problem, fix it right, and get you back on the road — no parts cannon nonsense.
Learn MoreHeavy Duty & Commercial Trucks
Class 6, 7, and 8 truck service. DOT inspections, brake jobs, suspension, drivetrain. We understand downtime costs money — we work fast and we work right.
Learn MoreFarm & Heavy Equipment
Tractors, skid steers, excavators, combines — we keep the equipment that runs your operation in the field, not in the shop. On-site service available.
Learn MoreSouthwest Ohio's Diesel Shop.
Based in Harveysburg and serving working trucks, farms, and equipment operations across four counties of Southwest Ohio. Need us on-site? Just ask.
Greene · Montgomery
Got A Truck Down? Let's Talk.
Call the shop, send a message through the chat in the corner, or stop by during business hours. Whatever's easiest for you — we'll get you taken care of.
Call The ShopHarveysburg, OH 45032
8:00 AM – 6:00 PM
Common Questions.
Quick answers to what folks ask most. Still not sure? Call the shop or send a message and we'll get back to you.
What kinds of diesel work do you handle?
Just about everything diesel-related — pickup trucks (Cummins, Power Stroke, Duramax), medium and heavy-duty commercial trucks, farm equipment, and heavy machinery. From basic maintenance to full engine rebuilds and performance tuning.
Do you offer on-site or mobile service?
For farm and heavy equipment that can't easily come to the shop, on-site service is available depending on the job. Give us a call and we'll figure out the best option for your situation.
What areas do you serve?
We cover Warren, Clinton, Greene, and Montgomery counties in Southwest Ohio — including Harveysburg, Wilmington, Waynesville, Lebanon, Springboro, Franklin, and Xenia.
How quickly can you get me in?
Depends on the job and what's already in the bay, but we move fast — especially for working trucks and equipment where downtime is costing you money. Call us and we'll give you a straight answer.
Do you do performance tuning and deletes?
Yes — custom tuning and performance work is one of our specialties. Whether you're chasing power, towing capability, or efficiency, we'll build something dialed in for how you actually use your truck.