In-Depth Look at the Mild Hybrid Powertrain in the All-New 2025 Mercedes-Benz CLE

The all-new 2025 Mercedes-Benz CLE blends cutting-edge mild hybrid technology with the refined performance that defines the brand’s lineup. As a new addition to the Mercedes portfolio, the CLE aims to bridge the gap between luxury coupes and sports sedans, with two engines featuring advanced mild hybrid systems to improve efficiency and power delivery. In this article, we take a closer look at the mild hybrid powertrain technology found in the CLE and explore its features and performance.

A New Generation of Mild Hybrid Powertrains

The 2025 CLE is available with two engine options, both incorporating a 48-volt mild hybrid system (MHEV). This technology works by integrating a belt-driven starter-generator into the powertrain, which allows for smoother transitions between electric and gasoline power. The result is improved fuel efficiency, better low-end torque, and enhanced responsiveness, giving drivers a seamless driving experience.

The CLE offers a balance of power and eco-consciousness, ensuring lower emissions without compromising the dynamic performance expected from a Mercedes-Benz.

Engine Options with Mild Hybrid Assistance

1. 2.0-Litre Inline-4 Engine
• Horsepower: 255 hp
• Torque: 295 lb-ft
• Performance: The four-cylinder engine delivers ample power for everyday driving and spirited highway cruising, aided by the 48-volt system, which provides an extra burst of torque during acceleration.
2. 3.0-Litre Inline-6 Engine
• Horsepower: 375 hp
• Torque: 369 lb-ft
• Performance: The inline-6 offers greater power and refinement, making it ideal for those seeking sportier performance. The mild hybrid system assists with smooth acceleration and helps conserve fuel during low-speed cruising or when coasting.

How the 48-Volt Mild Hybrid System Works

The 48-volt electrical system allows the CLE to perform functions that go beyond those of traditional gasoline engines. The integrated starter-generator acts as both a motor and an alternator. It captures energy during braking and stores it in a small battery, which can then be used to assist the engine during acceleration or to power onboard systems.

This technology allows the CLE to “sail” or coast at higher speeds with the engine off, reducing fuel consumption. In stop-and-go traffic, the system ensures smoother restarts, eliminating the typical engine shudder when the vehicle starts moving again after idling.

Benefits of Mild Hybrid Technology

• Fuel Efficiency: The mild hybrid system reduces fuel consumption by optimizing engine performance and enabling energy recovery during braking.
• Smooth Performance: Transitions between engine on/off states are seamless, providing a more refined driving experience.
• Additional Torque: During acceleration, the starter-generator delivers extra torque, making the CLE feel more responsive without increasing emissions.
• Improved Comfort: The mild hybrid system powers electrical systems such as climate control and infotainment, even when the engine is off, ensuring uninterrupted comfort for passengers.

Driving Modes and Power Optimization

The CLE’s mild hybrid powertrain works in harmony with the vehicle’s dynamic driving modes. Drivers can select from multiple modes—such as Eco, Comfort, Sport, and Sport+—that adjust engine response, suspension settings, and power delivery. In Eco mode, the system prioritizes energy recovery and fuel savings, while Sport mode unleashes the full potential of the engine with immediate power delivery assisted by the mild hybrid system.

Technology and Features Complementing the Powertrain

In addition to the advanced mild hybrid engines, the 2025 CLE is equipped with the latest in Mercedes-Benz technology:

• MBUX Infotainment System: The newest iteration of Mercedes’ user interface provides voice-activated controls, smartphone integration, and real-time performance data.
• Active Brake Energy Recovery: The system captures kinetic energy during braking, improving efficiency by storing energy for later use.
• Adaptive Cruise Control with Energy Optimization: This feature uses data from the navigation system and radar sensors to maintain an efficient speed, leveraging coasting and regenerative braking when possible.
• Start/Stop Functionality: The mild hybrid system allows for smooth automatic start/stop operation, minimizing fuel consumption in heavy traffic.

Efficiency Without Compromise

The mild hybrid technology in the CLE engines demonstrates Mercedes-Benz’s commitment to balancing performance and efficiency. While not fully electric or plug-in, the CLE offers measurable fuel savings without requiring the driver to alter their habits or worry about charging stations. The combination of traditional combustion and 48-volt technology ensures that the CLE delivers excellent performance while emitting fewer pollutants.

Conclusion

The 2025 Mercedes-Benz CLE showcases the future of luxury vehicles with its mild hybrid powertrain. Available with both a 2.0-litre inline-4 and a 3.0-litre inline-6 engine, the CLE ensures a refined and dynamic driving experience enhanced by mild hybrid technology. Whether prioritizing efficiency or craving performance, the CLE offers drivers the best of both worlds. With smooth acceleration, reduced fuel consumption, and advanced technology, the CLE is poised to lead its class as a new benchmark for luxury coupes and sedans.