Free diesel tools
Built for diesel owners. No signup, no cost. Everything runs in your browser.
Fault Code Lookup
Enter a diesel fault code, get the meaning and the fix.
Towing Calculator
Can your truck safely pull that trailer?
Diesel vs Gas Cost
True ownership cost and break-even mileage.
Tire Size Converter
Compare sizes, see speedometer error.
MPG ↔ L/100km
Convert fuel economy both ways.
DEF Estimator
How much DEF your truck actually uses.
Maintenance Scheduler
Full service schedule for your engine.
Ram vs Ford vs GM
The big three diesels compared.