MaxxForce 13 (Legacy — Avoid)
12.40L Inline-6 turbo diesel • Navistar (International)
About the MaxxForce 13 (Legacy — Avoid)
The MaxxForce 13 was Navistar's failed attempt to use 'massive EGR' to meet EPA 2010 emissions standards without using DEF/SCR aftertreatment. Every other heavy-truck manufacturer (Cummins, Detroit, PACCAR, Volvo, Mack) adopted SCR with DEF — Navistar bet the company on the alternative EGR-only approach. The bet failed catastrophically. MaxxForce 13 engines had severe reliability problems: head gasket failures, EGR cooler failures, turbo failures, and broad customer dissatisfaction. Navistar's truck sales collapsed during the MaxxForce era (2010-2015), and the company was forced to abandon the EGR-only approach and license SCR technology from Cummins. The MaxxForce 13 was discontinued in 2015 and replaced by the International A26 in 2016. **Avoid used trucks with MaxxForce 13 engines** — they're heavily discounted but for good reason.
Overview
The MaxxForce 13 was Navistar's failed attempt to use 'massive EGR' to meet EPA 2010 emissions standards without using DEF/SCR aftertreatment. Every other heavy-truck manufacturer (Cummins, Detroit, PACCAR, Volvo, Mack) adopted SCR with DEF — Navistar bet the company on the alternative EGR-only approach. The bet failed catastrophically. MaxxForce 13 engines had severe reliability problems: head gasket failures, EGR cooler failures, turbo failures, and broad customer dissatisfaction. Navistar's truck sales collapsed during the MaxxForce era (2010-2015), and the company was forced to abandon the EGR-only approach and license SCR technology from Cummins. The MaxxForce 13 was discontinued in 2015 and replaced by the International A26 in 2016. **Avoid used trucks with MaxxForce 13 engines** — they're heavily discounted but for good reason.
Specifications
- Manufacturer
- Navistar (International)
- Displacement
- 12.40 liters
- Configuration
- Inline-6 turbo diesel
- Fuel type
- Diesel
- Horsepower
- 370–475 hp
- Torque
- 1250–1700 lb-ft
- Production years
- 2010–2015
- Truck classes
- Class 8
- Applications
- Long haul, regional (historical)
Design and engineering
12.4L inline-6 with very aggressive EGR (Exhaust Gas Recirculation) to meet emissions without DEF. The massive EGR rates produced extreme heat and stress on engine components that proved unmanageable.
Generations and emissions eras
Reliability and longevity
Among the worst-reliability heavy-duty diesels ever produced. Failure rates were 3-5x higher than competing engines. Class-action lawsuits and customer settlements followed. The engine destroyed International's brand reputation for nearly a decade.
Common problems
Head gasket failures (frequent, expensive). EGR cooler failures (rampant). Turbo failures. Exhaust manifold cracks. Coolant intrusion. Most MaxxForce 13 engines didn't reach 500K miles before needing major service.
Maintenance schedule
Frequent — but no maintenance schedule could prevent the inherent design flaws.
Pros and cons
✓ Pros
- • Lower acquisition cost on used trucks (heavily discounted)
- • No DEF system to maintain
⚠ Cons
- • Catastrophic reliability — major component failures common before 500K miles
- • Discontinued 2015 — no new production
- • Resale value is rock-bottom
- • Parts and service costs higher than competitors
- • Class-action lawsuit history
- • Insurance carriers may charge more for trucks with this engine
Resale value impact
MaxxForce 13-equipped International ProStar trucks sell for 40-60% less than equivalent Cummins-powered ProStars. The discount reflects known reliability issues — many fleet buyers simply won't bid on MaxxForce 13 trucks at any price.