Diesel Repair in Appleton

For the residents of Appleton, managing a fleet of vehicles can often feel overwhelming, especially when unexpected repairs arise. At Ryan's Diesel Service, we understand the challenges you face, whether you're dealing with light-duty pickups or heavy-duty semis. Our local expertise ensures that we can swiftly address your needs, and with our mobile service truck, we bring our top-notch repairs right to your location. From routine maintenance to essential Department of Transportation inspections, we’ve got your fleet covered, no matter its size. Trust in our commitment to quality service, and let us partner with you in keeping your vehicles running smoothly and efficiently.

High End Diesel Products Is Our Specialty

Ryan’s Diesel Service is no stranger when it comes to the manufacturing of high-end diesel products.

Learn more about us HERE

Warranties on Our Turbos

Outlined on product pages and HERE

All Turbos Are Manufactured in House

We believe all products should be manufactured in-house to maintain high levels of quality control.

Our Customers Love Us

Over 100 Reviews on google with a 5 star rating. View HERE

High End Machining

We currently have a HAAS VF4 5-axis machining center which runs a fair majority of our products. We also have a HAAS TL-1 lathe.

Turbo balancing is all done in-house on either our West Coast Balancer WCB30 or CWT industries balancer.

Diesel Repair Services – Your Trusted Diesel Repair Shop in Wisconsin

At Ryan’s Diesel Service, we specialize in comprehensive diesel repair and maintenance for light and medium-duty diesel trucks and vehicles. With over 15 years of experience serving Southeastern Wisconsin, our ASE-level technicians deliver honest diagnostics, dependable repairs, and performance-driven service you can count on.

Whether you’re dealing with a hard-to-diagnose engine issue or need routine diesel system maintenance, our team has the expertise and equipment to keep your diesel running strong.

What We Repair

We provide a full suite of diesel repair services, including:

  • Engine and Drivetrain Repair
  • Diesel engine diagnostics and repair
  • Fuel system service, tuning, and injector replacement
  • Turbocharger replacement, rebuilds, and upgrades
  • Engine swaps and rebuilds

Diesel Performance & Upgrades

  • Performance enhancements and tuning
  • Drop-in turbos and custom builds
  • Power delivery optimization

Suspension, Transmission & More

  • Transmission diagnostics and repair
  • Suspension and drivetrain upgrades
  • Electrical system troubleshooting

Advanced Diagnostics

Our shop uses state-of-the-art tools to pinpoint performance issues fast- saving you time and money on unnecessary repairs.

Why Choose Ryan’s Diesel Service?

When you choose Ryan's Diesel Service, you are supporting a locally owned business deeply rooted in the Appleton community. Our team brings years of specialized experience, ensuring that every repair is backed by industry expertise and meticulous attention to detail. Whether managing a fleet of five or fifty vehicles, we have the capacity to meet your diverse needs, handling everything from light-duty pickups to over-the-road semis. Our services include comprehensive Department of Transportation (DOT) inspections, ensuring your vehicles remain compliant and roadworthy.

What sets us apart is our mobile service truck, which allows us to perform essential repairs right at your location, minimizing downtime and maximizing your productivity. At Ryan's Diesel Service, we prioritize customer satisfaction with a commitment to delivering reliable solutions. Your trust matters to us, and we offer a 12-month warranty on all parts and labor, providing peace of mind with every service. With us, you can expect both quality and convenience tailored to your business.

Contact Us

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