STL Diesel Blog

Duramax / November 12, 2026

Underneath the surface, GM engineered this engine to take a serious beating. It features a Compacted Graphite Iron (CGI) block for immense structural strength, paired with heavy-duty steel pistons and a forged crankshaft. Combined with a clever dual-stage air-to-water intercooler and a high-efficiency variable geometry turbo, the Mongoose stays cool and responsive even when you're hauling massive loads up grueling mountain passes.

Maintenance / October 2, 2026

Modern engines rely heavily on variable valve timing (VVT) systems, turbochargers, and precise hydraulic tensioners—all of which depend on clean oil pressure to operate properly. Contaminated oil can cause valve phasers to stick, leading to misfires, reduced fuel efficiency, and costly timing chain failures.

Maintenance / September 8, 2026

Excessively high EGTs pose an immediate threat to the structural integrity of engine components. When combustion temperatures spike—often due to overly aggressive tuning, overloaded towing, or restricted airflow—the extreme heat weakens the metal, leading to cracked exhaust manifolds, warped cylinder heads, and melted pistons.

Power Stroke / August 28, 2026

The term "bulletproofing" a Ford 6.0-liter Powerstroke engine refers to a comprehensive series of aftermarket modifications designed to address well-documented factory design flaws and chronic reliability issues. While this process is famous among diesel enthusiasts, understanding its exact scope helps clarify what owners can realistically expect from their investments.

Cummins / August 21, 2026

When a heavy-duty diesel engine operates under load, high cylinder pressures cause combustion gases (known as blow-by) to slip past the piston rings and enter the crankcase. These gases pick up atomized oil mist and moisture along the way. Rather than venting those raw hydrocarbons into the atmosphere, the Ram’s closed-loop CCV system redirects them back into the intake stream to be re-burned.

Diagnostics / August 6, 2026

For medium-duty diesel truck owners and fleet managers, few dashboard warnings inspire as much dread as a Diesel Exhaust Fluid (DEF) fault light. Designed to reduce nitrogen oxide emissions via Selective Catalytic Reduction (SCR), the DEF system is precise, highly sensitive, and essential. When a component fails, the engine control unit often triggers a countdown into "limp mode," capping vehicle speed and risking costly downtime.