🔧 Cummins X15 Diesel Engine
The Cummins X15 (formerly ISX15) is a 15-litre inline-six diesel offered in three performance levels: Efficiency Series (400–450 hp), Performance Series (475–605 hp), and Connected Series (with telematics). It is the most widely specified engine in North American Class 8 trucking, available from Kenworth, Peterbilt, and Freightliner as an alternative to their proprietary power plants. The X15's XPI common-rail fuel system delivers up to 2,100 bar injection pressure, enabling class-leading fuel economy at highway speed.
Engine
Technical Specifications
| Type | Inline-6 Diesel (Single Overhead Cam) |
|---|---|
| Displacement | 14.9 L |
| Horsepower | 400–605 hp |
| Torque | 1,898–2,779 Nm |
| Emissions | EPA GHG21 compliant |
| Fuel System | Cummins XPI common-rail at 2,100 bar |
| Aftertreatment | SCR + DPF (no EGR on X15 Efficiency) |
| Oil Capacity | 45 L |
| Manufacturer | Cummins Inc., Columbus IN, USA |
| Msrp | $22,000–$36,000 (new engine) |