DIESEL MAINTENANCE AND REPAIR

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Specializing in Power Stroke, Cummins and Duramax Engines

Needed an oil change on my F250. The guys got me taken care of. Good service.
Got 4 new tires and excellent service from here. I highly recommend.
Jake’s team is awesome. Very knowledgeable and comfortable working on modded rigs. Would absolutely recommend them for anyone needing a good shop.
I was pulling my 5th wheel to Florida when I started getting engine light and trouble codes on my F350 dually as I was going through Charlotte around noon. I called State Line (15 minutes away and on my route) and Jake said stop in, we will look at it right away. There was plenty of room to back up my 5th wheel and unhook. Jake offered that we could stay there overnight if needed, he even offered to let us plug in for electric. They immediately diagnosed my issues. Jake communicated with me for approval and said they could get me back on the road before 5pm. We hung out in our camper and around 4pm Jake backed the truck up to our RV and said you're ready to get back on the road. I can't thank you enough for the immediate attention and getting us on our way. Overall wonderful experience with Jake and the team at State Line Diesel! We ended up making it to Fort Myers on schedule.
Had some issues with the truck while traveling. They got us in, did the repairs and we were back on the road the same day! Thank you!
Service was great, prices were great, and the information provided was even better. Will be returning.
I've wanted to find a reliable diesel repair shop for my 2001 F350 7.3 PS for routine maintenance. While preparing for my annual cross country camping trip my transmission decided to dump some fluid in the driveway. Much better to happen here than in the rockies imo. My search for a local repair shop led me to State Line Diesel in Rockhill, SC despite being a hour away and after meeting Matt and seeing the shop I know I made the right choice. To some, the facility may look in disarray but as an aircraft QC supervisor I found it organized and staffed with experienced techs who actually care about their work and helping others. I would highly recommend anyone needing diesel maintenance to check out State Line Diesel. Their attention to detail and the special projects they build and sponsor convinced me I've made the right choice.

I'll update my post after my truck is completed (diesel truck repairs take time) and I'm back on the road. These guys are definitely worth your time and business.
Honest review. Turbo replacement and new boost tubes added/grid heater delete.

What i liked:
They were able to get me in quick and worked with me on a timeline to get me on a trip. I believe that they know what they are doing and have the experience to handle issues with vehicles. They even put on new parts that had provided within my timeframe which is something that is hard to find. They are straight forward also which I think is a positive.
What I wished were better:
Communication of when things got in since I was on a time crunch and needed to know what I needed to do for my trip. The work performed was not complete once I got the chance to look at things, I found that my grill was not fully in place and none of the screws were tight, they were on but not secured. Once I got into the truck, new codes were introduced after the work was done but original code was gone. Come to find that the MAP sensor was never plugged back in causing them. I check the fitment of the parts, one of the couplers looks like it is out of the clamp allowing an air leak. Looking to the turbo itself, it is a brand new upgrade that comes with the a new actuator with it, now either it got some dirt in the time that I have had it or it is actually the original one that I had an issue with before which prompted me to come here. I cannot confirm that but it is working so I assume it is the new one, considering. These things are fixable but were overlooked, especially with coming out of repairs with new codes I figured there would be more commitment to service. They also kept my old parts that I provided so no core necessary.

Overall understanding all of this, I still would recommend and come back here for my bigger issues. Things happen but they are good at what they do and get you back on the road!
I had some work done on a company truck and they took good care of us. Great guys and honest work! I would highly recommend
The team at Stateline has always helped me when I was stuck, I just drop truck off and they get me fixed. They are not just a SEMA truck building shop , they help with all types of maintenance of your average Joe truck drivers
About Us

We deliver expert diesel repairs and custom upgrades without the hidden fees or the runaround.

When it comes to your truck, experience, skill, and attention to detail make all the difference in getting you back on the road quickly and safely. At State Line Diesel Performance LLC, we are the trusted diesel truck shop in the Charlotte, North Carolina area. With over 15 years of hands-on experience, our team provides the maintenance and repair services your truck needs to perform at its best.

We’ve built strong partnerships with leading brands in the industry, and we use OEM parts to ensure your truck runs reliably mile after mile. From routine maintenance like oil changes, fluid checks, and brake service to complex repairs including engine work, transmissions, and diagnostics, we handle it all with professionalism and no shortcuts.

Your truck is a vital part of your work, and you can rely on State Line Diesel Performance LLC to keep it running safely, efficiently, and dependably. When you need diesel maintenance or repair you can trust, we deliver results—every time.

Why Choose State Line?

Experience

15+ years of experience in the motorsports industry working with Hendrick Motorsports and Stewart Hass Racing.

Fleet Service and Repair

100%

Detail - Oriented

The attention to detail we deliver in all our services is second to none.

Maintenance and Repair

100%

Warranty

We offer a 12-month/12,000-mile workmanship warranty in addition to standard manufacturer warranties for our parts.

Customer Satisfaction

100%

State Line Diesel Performance LLC

Our Services

What Our Customers Say

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I was having a fueling issue on my truck, and the guys over here at State Line Diesel Performance LLC did diagnostics and found I had an injector going bad. Their communication was great throughout the whole process. They are very professional and completed the work in a timely manner. Truck runs like a top again. Highly recommend this shop!

5
Brock R.
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I had my Rough Country leveling kit put on my 2016 4Runner by the team at State Line Diesel Performance LLC, and the guys did a phenomenal job. Jake & Dawson answered all my questions and took care of my car just a few hours after I dropped it off. I can’t say enough about their professionalism & their knowledge of the business. I couldn’t be happier with the end result, and I plan on using these guys for all my cars’ needs. Top-notch service!

5
McCain B.
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Jake and the crew are awesome to work with. They can handle anything from routine maintenance or mid to wild one-off builds. The team did a fantastic job customizing my truck. The truck gets compliments everywhere I go and performs equally well. Glad to finally have talent in Rock Hill that can support the truck enthusiast crowd.

5
Jeff P.

Our Diesel Repairs in Action

See Truck Builds

See Truck Builds

Check Out Wheels

Check Out Wheels

View Engine Work

View Engine Work

Our Suppliers

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Our Amenities

Waiting Room

Waiting Room

Complimentary Wi-Fi

Complimentary Wi-Fi

Fresh Coffee

Fresh Coffee

Relax While We Work on Your Truck

We know your time is valuable. That’s why our shop is equipped with a comfortable waiting area designed to make your visit as smooth as possible. While our technicians take care of your truck or diesel vehicle, you can take advantage of:

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Free Wi-Fi

Stay connected, catch up on work, or stream your favorite shows.
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Comfortable Seating

Relax in a clean, climate-controlled environment.
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Convenient e-Waiting Options

Prefer not to wait on-site? We’ll keep you updated digitally so you can step out and return when your vehicle is ready.
At our shop, we’re not just focused on top-notch repairs and maintenance – we’re committed to making your experience easy, efficient, and stress-free.

Schedule Your Diesel Repair Today –

Get Back on the Road Faster