The Mercedes-Benz S 250 CDI BlueEFFICIENCY, part of the long-wheelbase (V221) S-Class range following the 2009 facelift, represented a significant entry point into the flagship luxury sedan for European markets. Produced from 2011 to 2013, this variant offered a compelling blend of S-Class refinement, fuel efficiency, and diesel power. It was primarily aimed at buyers prioritizing economy and long-distance comfort over outright performance, distinguishing itself from the more powerful S 350, S 500, and AMG models. The “BlueEFFICIENCY” designation highlighted Mercedes-Benz’s efforts to improve fuel consumption and reduce emissions across its range.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V221, facelift 2009) |
| Type (Engine) | S 250 CDI BlueEFFICIENCY (204 Hp) G-TRONIC |
| Start of production | 2011 year |
| End of production | 2013 year |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 7.0-7.1 l/100 km (33.6 – 33.1 US mpg, 40.4 – 39.8 UK mpg, 14.3 – 14.1 km/l) |
| Fuel consumption (extra urban) | 5 l/100 km (47 US mpg, 56.5 UK mpg, 20 km/l) |
| Fuel consumption (combined) | 5.7-5.8 l/100 km (41.3 – 40.6 US mpg, 49.6 – 48.7 UK mpg, 17.5 – 17.2 km/l) |
| CO2 emissions | 149-151 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 8.2 sec |
| Acceleration 0 – 62 mph | 8.2 sec |
| Acceleration 0 – 60 mph | 7.8 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 9.7 kg/Hp, 103.6 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 253.8 Nm/tonne |
| Power | 204 Hp @ 4200 rpm |
| Power per litre | 95.2 Hp/l |
| Torque | 500 Nm @ 1600-1800 rpm (368.78 lb.-ft. @ 1600-1800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 651.961 |
| Engine displacement | 2143 cm3 (130.77 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Compression ratio | 16.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Twin-Turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Kerb Weight | 1970 kg (4343.11 lbs.) |
| Max. weight | 2605 kg (5743.04 lbs.) |
| Max load | 635 kg (1399.94 lbs.) |
| Trunk (boot) space – minimum | 560 l (19.78 cu. ft.) |
| Fuel tank capacity | 83 l (21.93 US gal | 18.26 UK gal) |
| Length | 5226 mm (205.75 in.) |
| Width | 1871 mm (73.66 in.) |
| Width including mirrors | 2120 mm (83.46 in.) |
| Height | 1479 mm (58.23 in.) |
| Wheelbase | 3165 mm (124.61 in.) |
| Front track | 1600 mm (62.99 in.) |
| Rear (Back) track | 1606 mm (63.23 in.) |
| Front overhang | 888 mm (34.96 in.) |
| Rear overhang | 1173 mm (46.18 in.) |
| Minimum turning circle | 12.2 m (40.03 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 7 gears, automatic transmission G-TRONIC |
| Front brakes | Disc |
| Rear brakes | Disc |
| Tires size | 235/55 R17 |
| Wheel rims size | 17 |
INTRODUCTION
The S 250 CDI BlueEFFICIENCY, introduced in 2011, was a key component of the post-facelift (V221) S-Class lineup. The V221 generation, produced from 2005 to 2013, represented a significant leap forward in Mercedes-Benz technology and luxury. The facelift in 2009 brought revised styling, improved efficiency, and updated technology. The S 250 CDI was specifically designed to appeal to buyers in Europe, where diesel engines were – and continue to be – highly favored for their fuel economy and torque. It slotted into the range below the S 350, offering a more accessible entry point to the S-Class experience without sacrificing the core values of comfort and prestige.
Powertrain & Engine Architecture
At the heart of the S 250 CDI lies the OM 651.961, a 2.1-liter inline-four cylinder diesel engine. This engine is a highly advanced design featuring common-rail direct injection and a twin-turbocharger setup with an intercooler. The twin-turbo configuration allows for both rapid response at low engine speeds and sustained power output at higher RPMs. The engine produces 204 horsepower at 4200 rpm and a substantial 500 Nm (368.78 lb-ft) of torque between 1600 and 1800 rpm. This torque delivery is particularly well-suited to the S-Class’s grand touring character, providing effortless acceleration and relaxed cruising. The engine boasts a high compression ratio of 16.2:1, contributing to its efficiency. Paired with the engine is the 7G-TRONIC automatic transmission, a seven-speed unit known for its smooth shifts and efficiency. This transmission was a staple of Mercedes-Benz vehicles during this period and played a crucial role in optimizing fuel economy.
Driving Characteristics
The S 250 CDI, while not a performance-oriented variant, delivers a surprisingly capable driving experience. The high torque output of the diesel engine provides strong acceleration, especially in the mid-range. The 0-62 mph (0-100 km/h) sprint takes approximately 8.2 seconds. The 7G-TRONIC transmission is programmed for comfort and smoothness, with gear changes being almost imperceptible during normal driving. Compared to the S 350 with its V6 engine, the S 250 CDI offers less outright power, but its superior torque and lower weight result in similar real-world performance in many situations. The gear ratios are optimized for fuel efficiency, with higher gears being engaged quickly to reduce engine speed at cruising speeds. While the S 250 CDI doesn’t offer the sporty feel of some of its siblings, it excels at providing a relaxed and refined driving experience, ideal for long journeys.
Equipment & Trim Levels
The S 250 CDI BlueEFFICIENCY came generously equipped, reflecting its position as a luxury vehicle. Standard features typically included leather upholstery, automatic climate control, a premium audio system, and a host of safety features such as ABS, ESP, and multiple airbags. The S-Class was renowned for its advanced technology, and the S 250 CDI was no exception, often including features like parking sensors, rain-sensing wipers, and automatic headlights. Optional extras included features like a panoramic sunroof, upgraded leather, a more advanced navigation system, and various driver assistance systems. Interior trim options varied, allowing buyers to personalize their vehicle with different wood veneers and color combinations.
Chassis & Braking
The S 250 CDI utilizes a fully independent suspension system, providing a comfortable and controlled ride. The front suspension features multi-link struts, while the rear utilizes a multi-link independent setup. The suspension is tuned for comfort, absorbing bumps and imperfections in the road with ease. Braking duties are handled by disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) and ESP (Electronic Stability Program) are standard, enhancing safety and stability. The S 250 CDI’s weight of approximately 1970 kg (4343.11 lbs) is relatively moderate for a full-size luxury sedan, contributing to its balanced handling.
Market Reception & Comparison
The S 250 CDI BlueEFFICIENCY was well-received by critics and buyers alike, particularly in Europe. It was praised for its fuel efficiency, comfortable ride, and luxurious interior. Compared to the S 350, the S 250 CDI offered significantly better fuel economy – around 5.7-5.8 l/100 km (41.3 – 40.6 US mpg) combined – making it an attractive option for those covering long distances. While the S 350 offered more power, the S 250 CDI’s torque delivery was often sufficient for most driving situations. The S 250 CDI also proved to be a more affordable entry point into the S-Class range, broadening its appeal.
Legacy
The OM 651 engine family, used in the S 250 CDI, has proven to be remarkably durable and reliable. With proper maintenance, these engines can easily exceed 200,000 miles (320,000 kilometers). The 7G-TRONIC transmission is also known for its longevity. On the used car market, the S 250 CDI represents a compelling value proposition, offering S-Class luxury and refinement at a more accessible price point. However, potential buyers should be aware of the potential maintenance costs associated with a complex luxury vehicle, including the diesel particulate filter and potential issues with the air suspension system (if equipped). Despite these considerations, the S 250 CDI BlueEFFICIENCY remains a desirable and well-regarded variant of the V221 S-Class.
