Engine Hours vs Miles: Smarter Diesel Maintenance Miles can lie—hours don’t. Learn how idle/PTO time translates to wear, how fleets convert hours to “equivalent miles,” and how to build an hour-based plan that fits your truck’s reality. Quick Summary: Track hours (and idle hours) • Convert to equivalent miles (20–35...

Safe Towing Temperatures: EGT, Transmission, Coolant & Oil—Real-World Ranges Know your numbers, probe locations, and what to do when temps creep. This is the practical playbook for long grades, headwinds, and summer heat—so you protect the engine, turbo, transmission, and aftertreatment. Quick Summary: EGT (pre) ≤ 1,200–1,250°F sustained • Trans...

Diesel Smoke Colors Decoded: Black, Blue, White—Causes & Real Fixes Seen haze in the mirror? Use this color-coded guide to diagnose efficiently, avoid parts darts, and fix the root cause—from charge-air leaks to valve seals, from cold misfire to coolant steam. Quick Summary: Black = air/fuel imbalance • Blue =...