STL Diesel Blog

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.

Diagnostics / August 5, 2026

A diesel turbocharger plays a critical role in boosting engine efficiency and power output by forcing compressed air into the combustion chamber. While turbos are built to withstand severe temperatures and high operational speeds, component wear and maintenance neglect can eventually lead to failure. Recognizing early warning signs helps prevent catastrophic engine damage.

Cummins / July 30, 2026

Late-model 6.7L Cummins hydraulic lifters can suffer premature wear that damages the camshaft and spreads metal through the engine.