You can have it all with the 2021 X12 and 2021 X15 powertrain lineup from Cummins. With a focus of uptime, total cost of ownership and ease of operations, the Cummins heavy-duty platforms bring you the best 15-liter and 12-liter engines yet. Starting with the most reliable 15-liter ever produced, to offering EX ratings for enhanced driver performance, the X15 and X12 give you the confidence needed to improve your business without sacrificing anything.

X12

Designed for the medium-bore market, the X12 brings the next level of efficiency and productivity to customers traditionally operating 11-13 liter powertrains. When combined with the Endurant HD transmission, customers will benefit from the lightest integrated powertrain option on the market and will see class-leading maintenance intervals.

X15 Efficiency Series

Optimized for linehaul and regional haul applications, the X15 Efficiency Series with EX Ratings sets the standards when it comes to over-the-road powertrain efficiency. 

X15 Productivity Series

If you need access to continuous power for the most demanding applications, the X15 Productivity Series provides up to 605 horsepower when using Performance Series hardware, and up to 500 horsepower when using the Efficiency Series hardware. The Productivity series is ideal for use in multi-purpose, vocational, or heavy-haul applications.

X15 Performance Series

The X15 Performance Series has been optimized for premium linehaul and/or heavy-haul customers that demand more than 500 horsepower. Starting at 525 horsepower and offering up to 565 horsepower with 2050 lb-ft torque the Performance Series will help you one of the first vehicles up the hill.

 

	X12	X15 Efficiency Series	X15 Productivity Series	X15 Performance Series
Horsepower (Kw)	350 – 500 (261-373	400-500  (298-373)	430-500 (321-373) with Efficiency Hardware 565-605 (421) with Performance Hardware	525-565 (391-421)
Peak Torque (N*m)	1350-1700 lb-ft (1830-2305)	1650-1850 lb-ft (2237-2508)	1650-2050 lb-ft (2237-2779)	1850-2050 lb-ft (2508-2779)
Peak Torque RPM	900/1000	950	950 with Efficiency Hardware 1000 with Performance Hardware	1000
Governed Speed RPM	1800/2000	1700	2000	1900
Ideal Applications	Linehaul / Regional Haul / Weight Sensitive / Vocational	Linehaul / Regional Haul	Multi-purpose, Vocational, Heavy-haul, Premium Linehaul	Premium Linehaul / Heavy Haul / Vocational
Engine Weight (dry)	2050 lbs (930 kg)	2961 lbs (1343 kg)