Diesel Mechanic – Class 8 Trucks & Trailers

Al-Warren-Oil-Company,-Inc.; Chicago (IL); On-site; USD 39,000 - 52,000; Full time

Benefits offered by this job

Paid time off

Holidays

Vacations

401(k) with company match

Health, dental, and vision insurance

HSA contributions

Company-paid life insurance

Short-term and long-term disability

Job summary

Al Warren Oil is seeking a dependable Truck & Trailer Mechanic to join our Chicagoland maintenance team. You will perform preventive maintenance, troubleshoot, and repair Class 8 trucks, tractors, tanker trailers, and related equipment to keep fleets running safely and reliably.

Ideal candidates bring experience with heavy-duty repair, diagnostic skills, and a commitment to quality. This on-site role supports DOT inspections and maintenance operations for a family-owned company dedicated to

Qualifications

• Experience repairing heavy-duty trucks or trailers or relevant diesel technician training.
• Strong troubleshooting skills and ability to use diagnostic equipment.
• Familiarity with fleet maintenance practices and DOT inspection requirements.

Responsibilities

• Inspect, diagnose, maintain, and repair heavy-duty trucks and trailers.
• Troubleshoot diesel engines, electrical systems, air brakes, suspension, steering, and drivetrain components.
• Repair trailer lighting, wiring, ABS systems, wheel seals, and related components.
• Complete scheduled maintenance and identify developing equipment problems.
• Perform safety inspections within your qualifications and support DOT inspection readiness.
• Document repairs, parts used, and follow-up maintenance needs accurately.
• Communicate equipment concerns with drivers, shop personnel, and operations.
• Perform authorized equipment moves and road tests when properly licensed.
• Maintain a clean, organized, and safe work area.

Skills

Heavy-duty truck repair

Troubleshooting

Fleet maintenance familiarity

DOT inspections experience

CDL preferred

Own basic tools

Tools

Diagnostic equipment

Welding

Fabrication

Job description

Build a career that keeps the Midwest moving.

At Al Warren Oil, the work we do helps other businesses do theirs. We deliver the fuel, lubricants, and services that keep fleets on the road, equipment running, and customers ready for the day ahead.

Our story began in 1948 with one truck and a commitment to dependable service. Today, Al Warren Oil is a third-generation, family-owned and operated company carrying that commitment forward. Our history reflects decades of showing up, earning trust, and building relationships that last.

For someone considering a career here, that means joining a business where your work has a visible purpose. Whether you’re driving, maintaining equipment, coordinating deliveries, or supporting daily operations, you help fulfill a promise customers depend on. With opportunities on and off the road, hands-on training, and an emphasis on safety, Al Warren Oil offers ways to put your skills to work and build new ones.

We’re looking for people who take pride in their work, follow through on their commitments, and understand that dependable service takes a team.

Bring your skills. Bring your drive. Help write the next chapter of Al Warren Oil.

Build your career keeping our fleet moving.

Al Warren Oil is seeking a dependable Truck & Trailer Mechanic to join our Chicagoland maintenance team. As a family-owned fuel and lubricant company, we depend on skilled technicians to keep our equipment safe, reliable, and ready to serve our customers.

This position performs preventive maintenance, troubleshooting, and repairs on Class 8 diesel trucks, tractors, tanker trailers, and related equipment. If you take pride in quality repairs and enjoy solving mechanical problems, we want to hear from you.

Job Responsibilities

• Inspect, diagnose, maintain, and repair heavy-duty trucks and trailers.
• Troubleshoot diesel engines, electrical systems, air brakes, suspension, steering, and drivetrain components.
• Repair trailer lighting, wiring, ABS systems, wheel seals, and related components.
• Complete scheduled maintenance and identify developing equipment problems.
• Perform safety inspections within your qualifications and support DOT inspection readiness.
• Document repairs, parts used, and follow-up maintenance needs accurately.
• Communicate equipment concerns with drivers, shop personnel, and operations.
• Perform authorized equipment moves and road tests when properly licensed.
• Maintain a clean, organized, and safe work area.

Requirements

• Experience repairing heavy-duty trucks or trailers, or relevant diesel technician training.
• Strong troubleshooting skills and the ability to use diagnostic equipment.
• Familiarity with fleet maintenance practices and DOT inspection requirements.
• Valid driver’s license; Class A CDL preferred.
• Own basic mechanic tools.
• Dependability, attention to detail, and the ability to work independently and with a team.
• Ability to perform essential job duties, with or without reasonable accommodation.
• Tanker trailer experience, welding, and fabrication skills are a plus.
• Competitive hourly pay with overtime opportunities.
• Paid time off, holidays, and vacations.
• Empower 401(k) retirement program with company matching beginning on day one.
• Blue Cross Blue Shield medical and prescription coverage, plus dental and vision benefits.
• Employer HSA contributions up to $2,400.
• Company-paid life insurance.
• Supplemental life insurance and optional short- and long-term disability coverage.