X15 Efficiency Series (2024)

The new X15 Efficiency Series continues to focus on your needs. It's the most efficient engine compliant with 2024 greenhouse gas standards, and the engine that keeps working for you.

Power

400 - 500 hp 298 - 373 kW

Torque

1450 - 1850 lb-ft 1966 - 2508 N•m

Certification

EPA 2024

Product Availability

Africa Middle East, Asia Pacific, Europe, India, Latin America, North America

Applications

Heavy-Duty Truck
Truck Equipment Manufacturers and Body Builders
X15 Efficiency Series

Uptime

The EPA2024 X15 Efficiency Series delivers more than just power and drivability. Rugged durability is ensured by the use of proven hardware while continuous improvements have resulted in reliability that provides peace of mind for trucking operations. With the best “Percent Zero Touch” and lowest “Touches Per Thousand” metrics to date, Cummins expects the trend to continue with the 2024 X15 product lineup.

The 2024 X15 gives you the confidence needed to improve your business without sacrificing anything.

Lower total cost of ownership

The X15 Efficiency Series for 2024 has demonstrated up to 1% fuel economy improvement for select customers when comparing their powertrain configuration to the 2021 product. With EX ratings providing up to an additional 1.75% fuel economy improvement in certain duty cycles the X15 Efficiency Series continues to help you get the most out of every drop of fuel. And with the longest service intervals in the industry – you’ll spend less money on maintaining your equipment and get more out of it.

Cummins' EPA24 X15 offers a proprietary, prognostic-based maintenance monitoring system that utilizes the expertise and ingenuity of Cummins’ engineering teams combined with the millions of miles of testing data, to deliver life-remaining forecasts on engine consumables including oil, oil filter, stage 2 fuel filter, DPF, and urea filter. This technology utilizes proprietary algorithms, expansive datasets, OilGuard insights (where applicable), and virtual sensor data to accurately forecast the appropriate change intervals for filters and oil through an easy-to-understand life remaining prediction.

Know more. Experience the best from your engine.

Cummins' commitment to engine innovation carries through to digital products and services that enhance the entire life of every Cummins engine. This includes connecting real-time data from vehicles on the road to maintenance and service operations, giving customers an unparalleled ability to look ahead, optimize operations, and minimize downtime.

Our engines come available with first-fit connectivity from the point of sale through Acumen®, our smart computing hardware, or via an OEM telematics device. These first-fit devices offer immediate access to Cummins’ full suite of digital capabilities, Connected Solutions®.  

  • Remote Diagnostics – Real-time monitoring of fault alerts and predictive insights for Cummins engines, helping fleets avoid unplanned downtime and reduce costs 
  • Over-the-Air Programming – Optimize your Cummins engine’s performance and efficiency by updating software and parameters remotely over-the-air 
  • Digital Service ToolsGuidanz® is Cummins’ all-in-one servicing technology suite that helps increase service bay productivity, repair speed and workflow management for a legendary service experience 

Ease of operation

The Cummins X15 Efficiency Series makes every driver better. With access to EX ratings,  the X15-powered powertrain operates better than ever. Features like SmartCoast and SmartTorque 2 can be enabled without requiring a unique calibration, and EX ratings provide the next level of powertrain optimization.

Complete coverage when you need It most

The X15 continues to be backed by a 2 year / 250,000 miles warranty with complete engine coverage available up to 5 Years / 500,000 miles when purchasing the new Protection Plan Plus Extended Coverage offering.

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.

Features & Benefits

  • 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
Specifications
Advertised Horsepower 400-500 hp
298-373 kW
Peak Torque 1450-1850 lb-ft
1966-2508 N•m
Governed Speed 1700 RPM
Clutch Engagement Torque 1000 lb-ft
1356 N•m
Number of Cylinders 6
System Weight 3152 lb
1430 Kg
Engine (Dry) 2961 lb
1343 Kg
Aftertreatment System 191 lb
87 Kg


To access our complete brochure library, click here.
Ratings

 Called either “standard” or “straight torque” ratings, the following rating choices provide similar performance in all gears.

Rating Horsepower (Kw) Peak Torque Lb-ft @ 900 RPM (n*m)
X15 450 450 (336) 1650 (2237)
X15 450 450 (336) 1750 (2373)
X15 450 450 (336) 1850 (2508)
X15 500 500 (373) 1650 (2237)
X15 500 500 (373) 1850 (2508)

 

SmartTorque (ST) ratings provide an additional 200 lb-ft torque in the top 2 gears, keeping drivers in the efficient gears longer.

Rating Horsepower (Kw) Peak Torque Lb-ft @ 900 RPM (n*m)
X15 400ST 400 (298) 1450/1650 (1966/2237)
X15 400ST 400 (298) 1550/1750 (2102/2373)
X15 400ST 400 (298) 1650/1850 (2237/2508)
X15 450ST 450 (336) 1450/1650 (1966/2237)
X15 450ST 450 (336) 1550/1750 (2102/2373)
X15 450ST 450 (336) 1650/1850 (2237/2508)
X15 500ST 500 (373) 1650/1850 (2237/2508)

 

EX Ratings

New EX ratings provide dynamic powertrain performance with additional driveability and fuel economy benefits. EX ratings require the use of an Endurant HD transmission and GPS look-ahead data. With EX Ratings, 1650 lb-ft (2237 N*m) is the maximum torque available in the first 9 gears. 
 

Rating Horsepower (Kw) Peak Torque Lb-ft @ 900 RPM (n*m)
X15 400EX 400 (298) 1650 (2237)
X15 400EX 400 (298) 1750 (2373)
X15 400EX 400 (298) 1850 (2508)
X15 450EX 450 (336) 1750 (2373)
X15 450EX 450 (336) 1850 (2508)
X15 500EX 500 (373) 1850 (2508)

 

Torque and Horsepower Curves:

efficiency series torque curves

efficiency series hp curves

Maintenance
ITEM SEVERE
<5.0 MPG
SHORTHAUL
5.0 – 5.9 MPG
NORMAL
6.0 – 6.9 MPG
LIGHT
>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.

 

ITEM SEVERE
<5.5 MPG
NORMAL
5.5 – 6.5 MPG
LIGHT
>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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