2021 X15 Performance Series Engine

X15 Performance Series (2021)

Power 525 - 565 hp
391 - 421 kW
Torque 1650 - 2050 lb-ft
2237 - 2779 N•m
Certification EPA 2021

The Power to Perform

A refreshed X15 Performance Series is new to 2021 and designed to meet EPA and Greenhouse Gas Phase 2 requirements. While the X15 Performance Series is being updated from the 2017 version, many hardware changes have been in production since 2020 with the X15 Efficiency Series. Built with Uptime, improved Total Cost of Ownership and Ease of Operations in mind, the 2021 X15 Performance Series is the first choice for drivers that need the power to perform.


Heavy-Duty Truck Fire and Emergency Truck Equipment Manufacturers and Body Builders



The 2021 X15 Performance Series incorporated key product improvements launched with the 2020 X15 Efficiency Series and builds off the most successful product launch in Cummins history. With the best “Percent Zero Touch” and lowest “Touches Per Thousand” metrics to date, Cummins expects the trend to continue with the 2021 X15 product lineup. 
Cummins offers the longest service intervals in the industry – keeping you on the road and out of the service bay.

Lower Total Cost of Ownership

Providing up to a 2% fuel economy improvement can go a long way in reducing the amount of money spent of fuel per year. Add in the strongest engine brakes in the industry, and better lug-back capabilities to keep drivers in top gear longer, the X15 Performance Series gives you the power you need, with the fuel economy you always wanted. And with the longest service intervals in the industry, you’ll spend less money on maintaining your equipment and get more out of it.

Ease of Operation

The X15 Performance Series has been optimized for heavy-haul, premium linehaul, and performance-oriented customers in mind. With three ratings designed for the traditional over-the-road customer, and up to 605 horsepower with the Productivity Series ratings, spec’ing the right rating for your operation has never been easier. And with Cummins PowerSpec Web, you can compare and configure your powertrain online.

To help drivers operate more efficiently, the X15 Performance Series now offers powertrain features like SmartCoast and Predictive Cruise Control for compatible powertrains.

Backed by Cummins

With over 3700 authorized service and sales locations in North America, you’re covered. With a 2 year / 250,000 mile base warranty, and up to 5 years / 500,000 miles of extended coverage, we have your back.

To help configure your X15 Efficiency Series powertrain, find and contact your local Cummins expert or use Cummins PowerSpec Web to develop your own vehicle spec.

Advertised Horsepower 525-565 hp
391-421 kW
Peak Torque 1850-2050 lb-ft
2508-2779 Nm
Governed Speed 1900 RPM
Clutch Engagement Torque 1000 lb-ft
1356 Nm
Number of Cylinders 6
System Weight 3152 lb
1430 Kg
Engine (Dry) 2961 lb
1343 Kg
Aftertreatment System 191 lb
87 Kg

New to the 2021 X15 Performance Series engine is limited ratings optimized for heavy-haul and premium linehaul customers. Peak torque is available at 1,000 rpm, with governed engine speeds at 1,900 rpm for Performance Series ratings.

Rating Horsepower (Kw) Peak Torque Lb-ft @ 950 RPM (n*m)
X15 525 525 (391) 1850 (2508)
X15 565 565 (421) 1850 (2508)
X15 565 565 (421) 2050 (2779)


Torque and Horsepower Curves:

performance series torque curves

performance series hp curves

  • VGT Turbocharger – Highly reliable and precise design for rapid acceleration
  • XPI Fuel System – High pressure enables multiple injection events per cycle for industry-leading fuel economy and quieter operation 
  • Single-Module™ Aftertreatment System – A compact and lightweight system that offers increased ash capacity and extended maintenance intervals 
  • Fleetguard Fuel and Lube Filters – Superior holding capacity provides better protection and enables longer service intervals 
  • High-Capacity Electronic Control Module – This allows full integration of data inputs from all subsystems, optimizing performance
  • Cummins Engine Brake – With up to 600 braking horsepower, it’s the most powerful in the industry. Stronger braking capacity reduces wear on service brakes and replacement costs
<5.0 MPG
5.0 – 5.9 MPG
6.0 – 6.9 MPG
>7.0 MPG
OIL DRAIN INTERVAL 25,000 mi 50,000 mi 60,000 mi 75,000 mi
X15 OIL DRAIN WITH VALVOLINE PB 30,000 mi 55,000 mi 65,000 mi 80,000 mi
X15 OIL DRAIN WITH CUMMINS OILGUARDTM Extensions available Extensions available Extensions available Up to 100,000 mi
FUEL FILTER* 25,000 mi 50,000 mi 60,000 mi 75,000 mi

If combined percent idle time plus power takeoff (PTO) time is greater than 40% for Shorthaul, Normal, or Light intervals, use the next lower drain interval. 
*For Premium Blue users, the Fuel Filter interval matches the ODI.


<5.5 MPG
5.5 – 6.5 MPG
>6.5 MPG
DPF Ash Maintenance*** 250,000 - 400,000 m 400,000 - 600,000 mi 600,000 - 800,000 mi
DEF 300,000 mi / 6,750 hours
Valvetrain 500,000 mi / 10,000 hours / 60 months
Drive Belts 500,000 mi / 10,000 hours / 60 months
Crankcase Breather N/A
HC Doser N/A

***Cummins recommends using Cummins genuine DPFs over cleaning of the DPF at the DPF ash maintenance interval. Users can experience extended DPF ash maintenance using the DPF maintenance fault lamp (FC5383).

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