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 =...

Diesel Fuel Filters & Water Separation: Micron Ratings, Additives, and Winter Survival Stop no-start mornings, injector wear, and gelled filters. This deep dive explains micron ratings (absolute vs nominal), demulsifier vs emulsifier chemistry, restriction monitoring, cold-weather best practices, and a proven troubleshooting flow that fleets use to keep common-rail systems...