Diesel Mechanic – Class 8 Trucks & Trailers

Al Warren Oil Company, Inc.; Chicago (IL); On-site; USD 34,000 - 52,000; Full time

Benefits offered by this job

PTO & holidays

401(k) match

Health coverage (BCBS)

HSA contributions

Life insurance

Disability insurance

Job summary

Al Warren Oil Company, Inc. is seeking a dependable Truck & Trailer Mechanic to join our Chicagoland maintenance team.

You will perform preventive maintenance, troubleshoot, and repair Class 8 diesel trucks and trailers, helping keep our fleet safe, reliable, and on the road. Responsibilities include diagnosing engines and electrical systems, completing scheduled maintenance, and supporting DOT readiness while maintaining a clean, organized work area.

Qualifications

• Experience repairing heavy-duty trucks or trailers.
• Strong troubleshooting skills with diagnostic tools.
• Familiarity with fleet maintenance practices and DOT requirements.
• Valid driver’s license; Class A CDL preferred.
• Own basic mechanic tools.
• Able to work independently and with a team.
• Tanker trailer experience, welding, and fabrication skills are a plus.

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 and support DOT inspection readiness.
• Document repairs, parts used, and follow-up maintenance needs.
• 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 trucks

Troubleshooting

Diesel systems

DOT compliance

Tools & diagnostics

Tools

Diagnostic equipment

Welding equipment

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.