Mercedes-Benz OM473

Quick Facts

  • Manufacturer: Mercedes-Benz Trucks / Daimler Truck
  • Component Type: Heavy-Duty Diesel Engine
  • Common Applications: Long-Haul Trucks, Heavy Haul Operations, Construction Trucks, Fleet Tractors, Specialized Transport
  • Power Range: 421–625 horsepower
  • Torque Range: Up to 3,000 Nm (2,213 lb-ft)
  • Fuel Type: Diesel
  • Common Pairings: Mercedes PowerShift Automated Manual Transmission
  • Production Status: Current Production

Overview

The Mercedes-Benz OM473 is the flagship heavy-duty diesel engine in Mercedes-Benz’s commercial truck lineup. Designed for demanding long-haul transportation, heavy-haul operations, and specialized freight applications, the OM473 delivers exceptional power, torque, fuel efficiency, and durability.

As the largest engine in Mercedes-Benz’s heavy-duty engine family, the OM473 is widely used throughout Europe and international markets in the Mercedes-Benz Actros, Arocs, and other heavy commercial truck platforms. The engine incorporates advanced fuel injection systems, intelligent engine management, and modern emissions technologies to maximize performance while minimizing operating costs.

Its combination of high horsepower ratings, outstanding low-end torque, and proven reliability has made the OM473 one of the most respected heavy-duty diesel engines in the global trucking industry.

Key Characteristics

The Mercedes-Benz OM473 is engineered to provide strong pulling power, exceptional fuel economy, and long-term durability. Its inline six-cylinder architecture delivers smooth operation while maintaining excellent efficiency across a wide range of operating conditions.

One of its defining characteristics is its X-Pulse fuel injection technology, which allows extremely precise fuel delivery for improved combustion efficiency and performance.

The engine is also known for supporting long service intervals and dependable fleet operation under demanding commercial conditions.

Technical Specifications

Power Ratings

The Mercedes-Benz OM473 is commonly available in horsepower ratings ranging from 421 to 625 horsepower.

Torque Output

Torque ratings reach up to approximately 3,000 Nm (2,213 lb-ft).

Engine Configuration

The OM473 is an inline 6-cylinder diesel engine.

Displacement

15.6 Liters

Fuel System

Mercedes-Benz X-Pulse high-pressure common rail fuel injection system.

Cooling System

Heavy-duty liquid cooling system designed for long-haul and vocational applications.

Engine Weight

The OM473 is designed as a premium heavy-duty diesel platform optimized for durability and efficiency.

Common Applications

The Mercedes-Benz OM473 is commonly used in:

  • Long-haul transportation
  • Heavy-haul trucking
  • Fleet tractor operations
  • Construction trucks
  • Specialized transport vehicles
  • Oversized load transport
  • Bulk freight hauling
  • International freight operations

Advantages

The Mercedes-Benz OM473 provides several advantages for operators and fleets.

  • Exceptional torque output
  • Strong fuel efficiency
  • Advanced X-Pulse injection technology
  • Long service intervals
  • Excellent reliability
  • High horsepower availability
  • Modern emissions compliance
  • Strong international support network

Limitations and Considerations

While highly capable, the OM473 does have operational considerations.

  • Limited availability in North America
  • Advanced electronics require specialized diagnostics
  • Higher acquisition cost than smaller engines
  • Emissions systems require regular maintenance
  • May be oversized for lighter-duty applications

Maintenance and Ownership Notes

Routine maintenance for the OM473 includes oil and filter changes, fuel filter replacement, cooling system inspections, turbocharger inspections, emissions system monitoring, and electronic diagnostics.

Following recommended maintenance schedules helps maximize engine longevity and maintain fleet productivity.

Many operators report excellent durability and reliability when maintenance programs are properly followed.

Performance and Fuel Efficiency

The OM473 is designed to provide excellent fuel economy while maintaining strong heavy-haul and long-haul performance. Advanced engine management systems and X-Pulse fuel injection technology help optimize fuel consumption without sacrificing power.

The engine performs particularly well in long-distance transportation environments where fuel economy significantly impacts operating costs.

Many fleets select the OM473 because of its ability to balance performance, efficiency, and reliability.

Driver and Operator Considerations

Drivers often appreciate the OM473 for its smooth operation, strong low-end torque, and excellent highway performance.

The broad torque curve helps reduce shifting requirements and improves overall drivability across varying terrain.

Fleet operators value the engine’s ability to maintain productivity while minimizing downtime and fuel costs.

Buying Considerations

When evaluating an OM473-powered truck, buyers should consider operating requirements, maintenance history, emissions system condition, and service records.

The OM473 is particularly well suited for fleets requiring premium heavy-duty performance and long-distance efficiency.

Buyers should also evaluate transmission specifications and axle ratios to optimize overall vehicle performance.

Compatibility and Related Systems

The OM473 is commonly paired with:

  • Mercedes PowerShift automated manual transmissions
  • Fleet telematics systems
  • Electronic engine management systems
  • Advanced cooling systems
  • Heavy-duty drivetrain configurations
  • Predictive cruise control technologies

Variants and Configurations

The OM473 is available in multiple configurations designed for different applications.

  • Long-haul transport configurations
  • Heavy-haul specifications
  • Construction vehicle applications
  • Fleet tractor installations
  • International freight operations
  • Multiple horsepower and torque ratings

Comparison to Similar Equipment

The Mercedes-Benz OM473 is commonly compared to engines such as the MAN D38, Volvo D16, Scania V8, Cummins X15, and PACCAR MX-13.

Compared to smaller heavy-duty engines, the OM473 provides greater torque and horsepower potential. Compared to competing flagship engines, it offers excellent fuel efficiency and advanced electronic engine management systems.

Each engine offers different strengths depending on fleet requirements and operating environments.

Best Fit For

The Mercedes-Benz OM473 is best suited for:

  • Long-haul transportation
  • Heavy-haul operations
  • Oversized load carriers
  • International freight fleets
  • Construction fleets
  • Bulk freight operations
  • Specialized transport companies

Related Truck Types

Related Freight Types

Related Equipment Systems

Related Guides

Regulatory and Compliance Notes

The OM473 incorporates advanced emissions technologies including SCR systems, diesel particulate filters, exhaust gas recirculation systems, and sophisticated engine management software designed to meet modern emissions standards.

Proper maintenance of emissions-related systems is essential for compliance and long-term reliability.

Real World Operating Notes

In real-world fleet operations, the Mercedes-Benz OM473 has earned a reputation as one of the premier heavy-duty diesel engines available in global trucking markets. Operators praise its combination of power, fuel economy, durability, and advanced technology.

The engine continues to serve as Mercedes-Benz’s flagship commercial truck powerplant and remains a popular choice among fleets seeking premium heavy-duty performance.

Frequently Asked Questions

What is the Mercedes-Benz OM473?

The OM473 is a 15.6-liter heavy-duty diesel engine designed for long-haul, heavy-haul, and specialized transportation applications.

How much horsepower does the OM473 produce?

Depending on configuration, horsepower ratings range from approximately 421 to 625 horsepower.

What trucks use the OM473?

The OM473 is commonly found in Mercedes-Benz Actros and Arocs heavy-duty truck models.

Is the OM473 fuel efficient?

Yes. The OM473 is widely recognized for delivering strong fuel economy while maintaining excellent heavy-duty performance.

Availability and Where to Find

The Mercedes-Benz OM473 is available through Mercedes-Benz Trucks dealer networks, commercial fleet purchasing programs, international truck dealers, and the used heavy-duty truck marketplace throughout Europe and global markets.

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