2013-2017 Mercedes-Benz S-class (W222) S 300 BlueTEC (231 Hp) HYBRID 7G-TRONIC

The Mercedes-Benz S 300 BlueTEC Hybrid, produced between 2013 and 2017, was a significant variant within the W222 generation of the S-Class. Representing a bridge between traditional luxury and emerging hybrid technology, this model offered a diesel-electric powertrain aimed at maximizing fuel efficiency without sacrificing the comfort and prestige expected of the S-Class. It occupied a mid-range position in the W222 lineup, slotting below the more powerful S 500 and above the base S 250 CDI (where offered), appealing to buyers prioritizing economy and reduced emissions alongside luxury.

S 300 BlueTEC Hybrid: Powertrain & Engine Architecture

At the heart of the S 300 BlueTEC Hybrid lies the OM 651.921, a 2.1-liter inline-four cylinder diesel engine. This engine, a mainstay in the Mercedes-Benz lineup, is renowned for its robust construction and efficiency. It produces 204 horsepower at 3800 rpm and a substantial 368.78 lb-ft of torque between 1600-1800 rpm. The engine utilizes a sophisticated diesel commonrail fuel injection system, delivering precise fuel metering for optimal combustion. A turbocharger with an intercooler further enhances performance and efficiency. The engine’s compression ratio is a high 16.2:1, contributing to its thermal efficiency.

The “BlueTEC” designation signifies the inclusion of advanced emissions control technologies, including a particulate filter and selective catalytic reduction (SCR) system, allowing the vehicle to meet stringent Euro 6 emission standards. Crucially, the S 300 BlueTEC Hybrid isn’t simply a diesel engine with an electric motor tacked on. It’s a full hybrid (FHEV) system. A 27 hp electric motor, capable of producing 250 Nm (184.39 lb-ft) of torque, works in conjunction with the diesel engine. The combined system output is 231 hp. The electric motor is integrated into the powertrain, allowing for electric-only driving at low speeds and assisting the diesel engine during acceleration. The 7G-TRONIC PLUS seven-speed automatic transmission manages power delivery, offering smooth and efficient gear changes. This transmission is known for its responsiveness and adaptability, contributing to the refined driving experience.

Transmission Details & Hybrid System Operation

The 7G-TRONIC PLUS transmission in the S 300 BlueTEC Hybrid is specifically calibrated to work seamlessly with the hybrid system. It features a torque converter lockup clutch that engages at higher speeds to improve fuel efficiency. The hybrid system utilizes a lithium-ion battery pack to store energy recovered through regenerative braking. This energy is then used to power the electric motor, reducing the load on the diesel engine and improving fuel economy. The system automatically switches between electric, diesel, and combined power modes depending on driving conditions and driver input.

Driving Characteristics

The S 300 BlueTEC Hybrid delivers a unique driving experience. While not as overtly powerful as its V6 or V8 siblings, it offers ample torque for comfortable and confident cruising. Acceleration from 0-60 mph takes approximately 7.2 seconds, and 0-100 km/h is achieved in 7.6 seconds. The electric motor provides instant torque, filling in gaps in the diesel engine’s power delivery and resulting in smooth acceleration from a standstill. The 7G-TRONIC PLUS transmission contributes to a relaxed driving experience, with well-spaced gear ratios that keep the engine operating in its optimal range. The hybrid system is virtually imperceptible during normal driving, providing a seamless transition between power sources. Compared to the S 250 CDI, the hybrid offers a noticeable improvement in refinement and responsiveness, while the S 500 provides significantly more outright performance but at the cost of fuel economy.

Equipment & Trim Levels

As an S-Class, the S 300 BlueTEC Hybrid came standard with a comprehensive array of luxury features. Standard equipment typically included leather upholstery, automatic climate control, a premium sound system, and a host of advanced safety technologies such as adaptive cruise control, lane keeping assist, and automatic emergency braking. The interior featured the elegant and sophisticated design characteristic of the W222 S-Class, with high-quality materials and meticulous attention to detail. Dashboard configuration was consistent across the W222 range, featuring a large central display screen and intuitive controls. Optional extras included features such as a panoramic sunroof, massaging seats, a rear-seat entertainment system, and upgraded interior trim options. The S 300 BlueTEC Hybrid was generally offered with a relatively limited number of trim packages, focusing on enhancing existing features rather than drastically altering the vehicle’s core specification.

Chassis & Braking

The S 300 BlueTEC Hybrid utilizes an independent multi-link suspension system at both the front and rear axles. This suspension design provides a comfortable ride and precise handling. The suspension is tuned to balance ride comfort with body control, delivering a smooth and composed driving experience. The vehicle is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, enhancing safety and control. The electric steering system offers precise and responsive steering feel. The curb weight of the S 300 BlueTEC Hybrid is approximately 4276.97 lbs (1940 kg), which is comparable to other S-Class models in the W222 range.

Market Reception & Comparison

The S 300 BlueTEC Hybrid was generally well-received by automotive critics. It was praised for its fuel efficiency, refined driving experience, and luxurious interior. Critics noted that while it lacked the outright performance of higher-powered S-Class models, it offered a compelling combination of economy and luxury. Fuel economy figures are impressive, ranging from 53.5-50 US mpg combined, and CO2 emissions are relatively low at 115-124 g/km. Compared to the S 250 CDI, the hybrid offered improved refinement and a slightly more responsive driving experience. Compared to the S 500, it provided significantly better fuel economy but at the expense of performance. Reliability has proven to be generally good, with the OM 651 diesel engine being a well-proven unit. However, the complexity of the hybrid system does introduce potential for additional maintenance requirements over the long term.

Technical Specifications

Legacy

The S 300 BlueTEC Hybrid represents an important step in Mercedes-Benz’s journey towards electrification. While not a plug-in hybrid, it demonstrated the potential for combining diesel power with electric assistance to achieve significant fuel economy gains. On the used car market, these models are generally well-regarded, offering a luxurious and efficient driving experience. The OM 651 diesel engine is known for its durability, but potential buyers should be aware of the added complexity of the hybrid system and ensure that all components are functioning correctly. Regular maintenance, including checks of the battery pack and hybrid system components, is crucial for long-term reliability. The S 300 BlueTEC Hybrid remains a compelling option for buyers seeking a luxurious and fuel-efficient sedan.