The Mercedes-Benz CLS 500 V8 (408 hp) with the 9G-TRONIC automatic transmission, part of the X218 CLS Shooting Brake facelift introduced in 2014, represented a compelling blend of performance, luxury, and practicality within the Mercedes-Benz lineup. Produced through 2018, this variant occupied the upper echelon of the CLS range, positioned as a high-performance alternative to more traditional luxury sedans and wagons. It aimed to appeal to buyers seeking a stylish, spacious vehicle with significant power and advanced technology. The X218 generation, and particularly the facelifted models, were notable for refining the original CLS “four-door coupe” concept, offering a more sophisticated and technologically advanced package.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS Shooting Brake (X218, facelift 2014) |
| Type (Engine) | CLS 500 V8 (408 Hp) 9G-TRONIC |
| Start of production | 2014 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 12.1 l/100 km (19.4 US mpg, 23.3 UK mpg, 8.3 km/l) |
| Fuel consumption (extra urban) | 6.8 l/100 km (34.6 US mpg, 41.5 UK mpg, 14.7 km/l) |
| Fuel consumption (combined) | 8.8 l/100 km (26.7 US mpg, 32.1 UK mpg, 11.4 km/l) |
| CO2 emissions | 205 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 4.8 kg/Hp, 208.7 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 306.9 Nm/tonne |
| Power | 408 Hp @ 5000-5750 rpm |
| Power per litre | 87.5 Hp/l |
| Torque | 600 Nm @ 1600-4750 rpm (442.54 lb.-ft. @ 1600-4750 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 278.922 |
| Engine displacement | 4663 cm3 (284.55 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Compression ratio | 10.5:1 |
| Fuel injection system | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant capacity | 12.3 l (13 US qt | 10.82 UK qt) |
| Kerb Weight | 1955 kg (4310.04 lbs.) |
| Max. weight | 2580 kg (5687.93 lbs.) |
| Max load | 625 kg (1377.89 lbs.) |
| Trunk (boot) space – minimum | 590 l (20.84 cu. ft.) |
| Trunk (boot) space – maximum | 1550 l (54.74 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Length | 4953 mm (195 in.) |
| Width | 1881 mm (74.06 in.) |
| Height | 1419 mm (55.87 in.) |
| Wheelbase | 2874 mm (113.15 in.) |
| Front track | 1596 mm (62.83 in.) |
| Rear track | 1629 mm (64.13 in.) |
| Minimum turning circle | 11.21 m (36.78 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 9 |
| Gearbox type | Automatic transmission G-TRONIC |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 255/40 R18 |
| Wheel rims size | 18 |
Powertrain & Engine Architecture
At the heart of the CLS 500 V8 lay the M278.922 4.7-liter V8 engine. This engine was a cornerstone of Mercedes-Benz’s performance offerings during the early 2010s. It featured direct fuel injection, a sophisticated bi-turbocharging system (utilizing one turbocharger per cylinder bank), and an intercooler to manage intake air temperatures. The engine produced 408 horsepower at 5000-5750 rpm and a substantial 600 Nm (442.54 lb-ft) of torque available from a low 1600 rpm all the way to 4750 rpm. This broad torque curve, combined with the advanced 9G-TRONIC automatic transmission, provided effortless acceleration and strong in-gear performance.
The 9G-TRONIC transmission was a key component of this powertrain. With nine forward gears, it allowed for a wider range of ratios, optimizing both fuel efficiency and performance. The close gear spacing ensured the engine remained within its optimal power band during acceleration, while the higher gears contributed to lower engine speeds at highway cruising speeds, reducing noise and improving fuel economy. The transmission featured paddle shifters for manual control, although most drivers utilized the automatic mode.
Driving Characteristics
The CLS 500 V8 Automatic delivered a refined and powerful driving experience. The combination of the potent V8 engine and the smooth-shifting 9G-TRONIC transmission resulted in a 0-60 mph time of approximately 4.7 seconds and a limited top speed of 155 mph. While not as overtly sporty as some dedicated performance cars, the CLS 500 offered ample power for confident overtaking and effortless cruising. The automatic transmission was programmed for smooth shifts in comfort mode, but could be adjusted for more aggressive shifts in Sport mode. Compared to the CLS 350 models, the 500 V8 offered a significant performance advantage, while the diesel-powered CLS 350 CDI provided comparable torque but a different power delivery character.
Equipment & Trim Levels
The CLS 500 V8 typically came well-equipped as standard. Features included leather upholstery, wood trim, a premium sound system, dual-zone automatic climate control, and a comprehensive suite of safety technologies. Optional extras included advanced driver-assistance systems like adaptive cruise control, lane-keeping assist, and a head-up display. Interior color choices were extensive, allowing for a degree of personalization. The Shooting Brake body style itself added a level of practicality not found in traditional coupes, with a generous cargo area accessible through a power-operated rear liftgate.
Chassis & Braking
The CLS 500 V8 featured an independent suspension system at all four corners, with a McPherson strut setup in the front and a multi-link setup in the rear. This provided a comfortable ride quality while maintaining good handling characteristics. Ventilated disc brakes were standard on all four wheels, providing ample stopping power. The electronic stability program (ESP) and anti-lock braking system (ABS) were standard safety features. The suspension was tuned to balance comfort and handling, leaning towards the former given the car’s luxury positioning.
Market Reception & Comparison
The CLS 500 V8 was generally well-received by automotive critics. It was praised for its powerful engine, luxurious interior, and sophisticated technology. However, some reviewers noted that the ride could be firm on certain road surfaces, and the fuel economy, while respectable for a V8, was not exceptional. Compared to its rivals, such as the Audi A7 and BMW 6 Series Gran Coupe, the CLS 500 offered a unique blend of style, performance, and practicality. The Shooting Brake body style was a key differentiator, providing more cargo space than its competitors.
Legacy
The M278 V8 engine, while complex, has proven to be relatively reliable when properly maintained. Common issues include occasional turbocharger problems and oil leaks, but these are not widespread. The 9G-TRONIC transmission has also demonstrated good durability. Today, the CLS 500 V8 (X218) represents a compelling value on the used car market, offering a significant amount of performance and luxury for the price. It remains a desirable vehicle for enthusiasts seeking a stylish and capable grand tourer.
