MDC Diesel LLC

"24-Hour Mobile Diesel Engine, Truck And Trailer Repair"

About Us

In 2021, after more than a decade of hands-on experience in diesel mechanics, Chris Wysocki took a leap of faith and launched MDC Diesel LLC in Dwight, Illinois. For years, Chris had dreamed of owning his own business—one built on trust, skill, and a genuine commitment to helping others. He saw a growing need in the community for a reliable, experienced diesel mechanic who could deliver quality service without compromise. That vision became MDC Diesel.

What started as a one-man mobile repair service quickly grew into a trusted name across Dwight and its neighboring towns. Today, MDC Diesel is known for its 24-hour availability, roadside assistance, and full-service expertise in diesel engine repair, semi-truck and trailer service, and on-the-go diagnostics. Whether you're stranded on the highway or managing a fleet, MDC Diesel is ready to respond—anytime, anywhere.

Why Choose MDC Diesel?
We don’t just fix trucks—we keep businesses moving. Our team is proud to hold top industry certifications, including:
•ASE Certified
•ASE Master Diesel Heavy Truck Certified
•ASE Electronic Engine Specialist Certified
These credentials reflect our commitment to excellence and ensure every repair meets the highest standards of safety and performance. At MDC Diesel, we treat every job with care, every customer with respect, and every truck like it’s our own.

Serving You, Wherever You Are!
From roadside emergencies to routine maintenance, MDC Diesel is here to help you reach your destination safely and efficiently. We’re more than a repair service—we’re your partner on the road.

Areas Served

Our Certifications

ASE Certified
ASE Electronic Engine Specialist Certified
ASE Master Diesel Heavy Truck Certified

What We Offer

Our Specialties include:

When the unexpected happens, MDC Diesel LLC is ready—day or night. Our 24-hour availability means you’re never alone on the road, no matter the hour or the weather. Whether you're dealing with a flat tire, engine trouble, or a breakdown miles from the nearest town, our roadside assistance team responds quickly and efficiently to get you moving again. We understand how critical uptime is for drivers and fleets, and we’re committed to being the dependable partner you can count on when it matters most.

Our Services include:

Core Diesel Services: At MDC Diesel LLC, we specialize in keeping your diesel-powered vehicles running strong. Whether it's a routine checkup or a complex engine issue, our team is equipped to handle diesel repair, diesel engine diagnostics, and full-service truck and semi truck repairs. We understand the demands of the road and work hard to get your vehicle back in peak condition with precision and care.
Trailer Services: Your trailer is just as important as the truck pulling it, and we treat it that way. From semi trailer repairs to general trailer maintenance, MDC Diesel LLC ensures your equipment is safe, secure, and road-ready. Our technicians are trained to spot issues early and fix them fast, minimizing downtime and maximizing performance.
Mobile Services: When you're stuck on the road or can't make it to the shop, MDC Diesel LLC brings the shop to you. Our mobile diesel repair and mobile semi truck repair services are designed for convenience and speed. We come equipped to handle a wide range of issues on-site, helping you get back on the road without the hassle of towing or long waits.
Emergency & Roadside Services: Breakdowns don’t follow a schedule—and neither do we. MDC Diesel LLC offers 24-hour tire repair and roadside assistance to support drivers when they need it most. Whether it’s a flat tire in the middle of the night or a mechanical issue miles from the nearest town, our team is just a call away, ready to respond with dependable service and expert solutions.

Testimonials

On 6/22/2025 Jama Jama had this to say:
Chris is real good guy and he will what he's promised thanks Chris for coming out on Sunday.

On 9/29/2024 Kara Whitaker had this to say:
If your diesel truck ever breaks down in the Joliet, Illinois area, **you absolutely need to call this guy!** He responded quickly even though it was late on a Friday night, which was impressive in itself. His deep expertise became evident when he correctly diagnosed the issue over the phone based on the error code alone, without even seeing the truck in person. The next day, he confirmed the problem—a faulty injector pigtail—and got it fixed in no time. We were stranded with our truck and a 38-foot RV, and thanks to his quick thinking and efficiency, we were back on the road with minimal downtime. Highly recommend!

On 5/29/2024 ryan scott had this to say:
Awesome experience. Had some problems with my truck with horses in the trailer. Guy was at the gas station in 40 minutes and got my truck going.

On 2/13/2024 Brandy Blair had this to say:
Called theses guys in no time came out on a service call fix the issue! Highly recommend great people

On 2/1/2024 Olivier MUHIRWA had this to say:
Called February 1, 2024 around 3:00 am for trailer flat tire. Very good responding personnel and good service . They are fast and worthy pricing. Thank you .

Contact Us

MDC Diesel LLC
400 S Union St Dwight, IL 60420
Phone: (815) 955-5209
Email: mdcdiesel@yahoo.com

Where To Find Us

Payment Types Accepted

American Express, Cash, Debit Cards, Discover, MasterCard, PayPal, Visa

Our Hours

Holiday Hours May Vary. Please Call For Details.

Monday: Open 24 Hours 24-Hour Availability
Tuesday: Open 24 Hours 24-Hour Availability
Wednesday: Open 24 Hours 24-Hour Availability
Thursday: Open 24 Hours 24-Hour Availability
Friday: Open 24 Hours 24-Hour Availability
Saturday: Open 24 Hours 24-Hour Availability
Sunday: Open 24 Hours 24-Hour Availability

News

🚨 24/7 Emergency Diesel Repair 🚨
Breakdowns don’t wait—and neither do we. MDC Diesel offers around-the-clock roadside assistance for semi trucks, trailers, and diesel engines. Whether it’s midnight or midday, our ASE-certified team is ready to get you back on the road safely and quickly.

Call now for fast, reliable mobile service in Dwight, IL and beyond.
📞Call now!

Info

NTTS

FAQ

What types of vehicles do you service?

We specialize in medium to heavy-duty trucks, semi-trailers, recovery vehicles, and other diesel-powered heavy equipment.

Do you offer mobile repair services?

Yes! MDC Diesel provides 24-hour mobile repair services, including roadside assistance for diesel engines, trucks, and trailers.

Are your technicians certified?

Yes, our team consists of certified technicians with decades of experience across all makes and models.

How quickly can you respond to a service call?

We pride ourselves on fast response times—often arriving within 30 to 40 minutes depending on location and availability.

What makes MDC Diesel different from other repair services?

Our deep expertise, fast response times, and commitment to customer satisfaction set us apart. We diagnose issues quickly—even over the phone—and get you back on the road with minimal downtime.

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