Tri-County Service Department – Maintenance & Repair For Diesel Trucks Including Cummins Engines 


Tri-County Service – S.E. Michigan’s Leading Diesel Service Provider

Tri-County’s Service Department, with 73 service bays in five Tri-County branch locations (Dearborn, Flint, Jackson, Warren and Ypsilanti), factory-trained technicians with multiple certifications (ASE, MI, International) and the latest in computerized diagnostic equipment and tools, is uniquely positioned and committed to offering the finest quality diesel service and value in Southeast Michigan and the surrounding area.

All Makes – All Types of Diesel Service

An International Warranty Center, Tri-County also provides diesel service work of all types to All Makes and Models of diesel trucks.  Tri-County is authorized for CAT, Cummins, Allison & IC bus and is a major OEM drive train component warranty center.  Everything from oil changes to engine overhauls, D.O.T. inspections, rapid brake changes, Performance PMs, and more are all available at convenient locations at extended hours.  See our ‘Locations’ pages for the unique hours and service contact information at each Tri-County location.

Full Service Leasing, Contract Maintenance

Through our Idealease affiliate, Tri-County can also offer diesel truck owners the freedom of full-service leasing and contract maintenance.  Mobile maintenance is also available.  Click on the heading above to go to our website’s Idealease ‘Lease/Rental’ pages for more specific information. 

Shop Menu with Prices

Click on the heading above to see and/or print a one page list of our full range of services with pricing. (Note: Minor differences exist on branch location hourly rates)

Hourly Labor Rates: Tri-County International branches offer REDUCED LABOR RATES on various types of service such as brake jobs and all work related to preventive maintenance.  Inquire about our low maintenance rates! 

If you have a diesel service need,
Tri-County’s Service Department Can Do It For You!!!

Tri-County Services Performed Include (but are not limited to):

  • Service for All Makes and Models of Diesel Trucks
  • Oil Changes to Engine Overhauls
  • Quick Lube
  • D.O.T. Inspections
  • Rapid Brake Changes
  • Performance PMs
  • Contract Maintenance Available
  • Mobile Maintenance
  • Wrecker Service Available
  • Diesel Tank & Fuel Cleaning
  • NEW – DPF (Diesel Particulate Filter) Cleaning Service
  • Specials by Season & Major Component

Tri-County Service Department Assets Include:

  • Locations in Dearborn, Flint, Jackson, Warren & Ypsilanti
  • 73 Service Bays
  • ASE & State of Michigan-Certified Technicians
  • COPP Certified DT Overhaul Center
  • CAT, Cummins & Allison Authorized
  • Major OEM Drive Train Component Warranty Center
  • Navistar Fleet ISIS
  • Navistar Diamond Connection
  • Navistar Diamond Advantage
  • Latest Computer Diagnostic Equipment & Tools
  • Driver’s Lounge with Cable TV 

Service Request Form

Please tell us about your service need!  Click on the link below and fill out the fields within the form to give us some specifics.  A member of the Tri-County Service Team will be in contact with you to discuss and schedule your service request.