Heavy Duty Journal | Diesel Repair & Fleet Management Hub

BlogFuel Systems & Injection Technology

Diesel Fuel Injector Cleaner: Proven Fleet Manager’s Guide

Michael Nielsen June 7, 2026

BlogShop Operations & Workflow

Why Heavy-Duty Repair Shops Are Replacing Legacy Systems — And What They’re Switching To

June 5, 2026 Blog

BlogCompliance & Safety Management

Driver Vehicle Inspection Report (DVIR): A Complete Guide for Fleet Managers

June 3, 2026 Blog

BlogCompliance & Safety Management

Distracted Driving: The Real Cost to Your Commercial Fleet

June 2, 2026 Blog

Heavy-Duty Truck Repair — 24/7 Roadside Service

Fleet Management & Strategy

BlogFleet Management & Strategy

Fleet TCO Guide: Calculate True Vehicle Ownership Costs [2025]

BlogFleet Management & Strategy

DOT Pre-Trip Inspection: Complete Checklist and Guide

Fleet truck with windshield dashcam parked at a warehouse loading area during evening safety operations.

BlogCompliance & Safety Management

Fleet Dashcam Buying Guide: What Commercial Fleets Must Know

BlogFleet Management & Strategy

Fleet Preventive Maintenance ROI: Complete 2025 Guide

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Shop Business & Growth

Blog Shop Business & Growth

Diesel Shop Marketing Strategies: Complete 2025 Guide

November 13, 2025 No Comments

Diagnostics & Technology

Blog Diagnostics & Technology

How to Find Your Truck’s SPN and FMI Fault Codes: Complete Guide

Learn 4 methods to find SPN and FMI fault codes on your semi truck. Dashboard access, scanner options, smartphone apps, plus complete FMI reference table.

December 27, 2025

Blog Diagnostics & Technology

OBD-II vs J1939: Essential Guide for Fleet Diagnostics

Learn the key differences between OBD-II vs J1939 diagnostic protocols. Understand communication architectures, code formats, and tool requirements for fleet operations.

November 12, 2025

Editor’s Pick

Customer Service & MarketingEditors Pick

Truck Repair Directory Marketing: Complete ROI Guide [2025]

Alternative Fuel & Green TechnologyBlog

Rivian Commercial Van: Specs, Pricing, and What Fleet Managers Need to Know

BlogEditors Pick

7 Common Cummins ISX Problems: Complete Repair Guide

BlogEditors Pick

Women Fleet Managers: Leadership Driving Fleet Performance

New Resource

The HDJ Diesel Mechanic Tools Guide

96 professional tools across 9 categories — curated from 15+ years in the trade.

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Truck Fault Code Lookup

Decode SPN & FMI codes instantly. Get plain-English explanations, drivability guidance, probable causes, and repair cost estimates.

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Preventative Maintenance

Nov13

DPF Cleaning and Maintenance: Complete Fleet Service Guide

Expert DPF cleaning maintenance solutions for commercial fleets. Reduce downtime, improve fuel efficiency, and extend filter life with proven service techniques.

Nov19

Fleet Oil Analysis: Complete Guide to Preventing Failures

Learn how fleet oil analysis prevents catastrophic engine failures and delivers 300%+ ROI. Covers sampling techniques, wear metals, and implementation strategies.

Free Download

Diesel Maintenance Checklist

2026 Edition

Complete PM schedule from daily pre-trip to annual DOT inspection. Built for real shops.

50+Checkpoints

6Service Intervals

1Page PDF

Instant PDF No spam 100% free

AI & Fleet Technology

AI & Fleet Technology

How to Evaluate AI Fleet Management Software: Complete Guide

January 31, 2026 No Comments

Fleet safety inspector conducting a commercial truck safety inspection with a checklist beside a Class 8 semi-truck at a fleet terminal, representing driver safety, compliance, and risk management.

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Shop Operations & Workflow

Shop Bay Management: 5 Proven Strategies to Maximize Throughput

Michael Nielsen October 16, 2025 Blog Shop Operations & Workflow

Heavy-Duty Repair Shop Productivity: Complete Guide

Michael Nielsen November 19, 2025 Blog Shop Operations & Workflow

Blog Owner Operator

How to Start an Owner Operator Trucking Business [2025 Guide]

Michael Nielsen December 12, 2025

Complete guide to starting an owner operator trucking business. Covers startup costs, CDL requirements, insurance, financing, and finding profitable loads.

Tools & Equipment Reviews

Blog Heavy Machinery & Construction Equipment

Truck Wheel Balancer Guide: Electronic vs. Manual for 2025

Michael Nielsen November 16, 2025

Compare top truck wheel balancers for commercial shops. Reviews of Hunter, Coats, Ranger, and Hofmann models plus buying guide for fleet service operations.

Customer Service & Marketing

Diesel technician servicing a semi-truck at a commercial fleet yard, representing heavy-duty industry expertise and guest posting authority for trade publications.

BlogCustomer Service & Marketing

Guest Posting for Heavy-Duty Industries: Which Sectors Benefit and How to Get Started

Discover which heavy-duty industries benefit most from guest posting — from trucking and construction to mining, agriculture, and renewable energy. Learn how to build authority, ...

BlogCustomer Service & Marketing

How Truck Repair Shops Can Build Online Content Exposure

Learn how truck repair shops build online content exposure through website optimization, local SEO, Google Business Profile, and reputation management.

DEF Injector Problems: Symptoms, Causes & Repair Guide

November 12, 2025 No Comments Blog Fuel Systems & Injection Technology

Learn to diagnose and fix DEF injector problems. Covers symptoms, root causes, testing procedures, cleaning vs. replacement, and prevention strategies.

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Cybersecurity & Freight Fraud Defense

Ransomware Recovery: What to Do When Your Shop Gets Locked Out

January 17, 2026 No Comments

Learn how to respond to a trucking ransomware attack with proven recovery steps to restore operations, protect data, and minimize downtime fast.

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