2003 Chevrolet Silverado 2500LT Duramax
“The LB7 + Allison combo is basically a diesel legend.”
Documented Miles
344,000
on the odometer
Reliability Score
87/100
community rating
Est. Total Maintenance
$41,200
lifetime spend
Est. Savings vs. New
$30,800
vs. buying new
Engine
6.6L Duramax LB7 Diesel (V8)
Allison 1000 6-Speed
Drivetrain
4WD
2003 model year
The Duramax LB7 paired with the Allison 1000 transmission is one of the most respected diesel combinations ever put in a pickup. Phil's done two injector sets — the LB7's known weakness — and kept everything else stock.
Maintenance Guide
The exact schedule that helped this vehicle reach 344k miles. Estimated lifetime maintenance: $41,200 over 344,000 miles ( $11.98 per 100 miles ).
Every 5,000 miles
- Diesel oil change (15W-40 or 0W-40)
- Fuel filter every 10k
- Check coolant DCA level
Note: This schedule is based on owner-reported data and community experience. Always consult your owner's manual and adapt to your driving conditions. Severe duty (towing, off-road, extreme heat/cold) typically requires shorter intervals.