Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Coupe (C140) |
| Type (Engine) | S 420 V8 (279 Hp) 5G-TRONIC |
| Start of production | September, 1995 |
| End of production | May, 1996 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 15.6 l/100 km (15.1 US mpg, 18.1 UK mpg, 6.4 km/l) |
| Fuel consumption (extra urban) | 8.7-10.4 l/100 km (27 – 22.6 US mpg, 32.5 – 27.2 UK mpg, 11.5 – 9.6 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.5 sec |
| Acceleration 0 – 62 mph | 8.5 sec |
| Acceleration 0 – 60 mph | 8.1 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Weight-to-power ratio | 7.2 kg/Hp, 139.2 Hp/tonne |
| Weight-to-torque ratio | 5 kg/Nm, 199.5 Nm/tonne |
| Power | 279 Hp @ 5700 rpm |
| Power per litre | 66.5 Hp/l |
| Torque | 400 Nm @ 3900 rpm (295.02 lb.-ft. @ 3900 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 119.981 |
| Engine displacement | 4196 cm3 (256.06 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 92 mm (3.62 in.) |
| Piston Stroke | 78.9 mm (3.11 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 16.5 l (17.44 US qt | 14.52 UK qt) |
| Kerb Weight | 2005 kg (4420.27 lbs.) |
| Max. weight | 2600 kg (5732.02 lbs.) |
| Max load | 595 kg (1311.75 lbs.) |
| Fuel tank capacity | 100 l (26.42 US gal | 22 UK gal) |
| Length | 5065 mm (199.41 in.) |
| Width | 1912 mm (75.28 in.) |
| Height | 1452 mm (57.17 in.) |
| Wheelbase | 2945 mm (115.94 in.) |
| Front track | 1614 mm (63.54 in.) |
| Rear track | 1587 mm (62.48 in.) |
| Minimum turning circle | 11.91 m (39.07 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears | 5 |
| Gearbox type | automatic transmission G-TRONIC |
| Front suspension | Coil spring, Double wishbone, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer, Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 255/45 R18 |
| Wheel rims size | 8.5J x 18 |
The Mercedes-Benz S-Class Coupe (C140) S 420 V8, produced from September 1995 to May 1996, represented a luxurious and powerful offering within the C140 coupe range. Positioned as a mid-range performance option, it slotted between the S 320 and the flagship S 500 models. This two-door coupe aimed to deliver a blend of grand touring comfort and respectable performance, appealing to buyers seeking a more sporting alternative to the traditional S-Class sedan. The C140 generation itself was a significant departure from its predecessor, offering increased size, enhanced refinement, and a host of technological advancements for its time.
Powertrain & Engine Architecture
The S 420 V8 was powered by the M119.981 engine, a 4.2-liter naturally aspirated V8. This engine was a cornerstone of Mercedes-Benz’s engineering prowess during the 1990s, known for its smoothness and reliability. It featured a cast-iron block with aluminum cylinder heads, and utilized a multi-port fuel injection system. The double overhead camshafts (DOHC) operated four valves per cylinder, contributing to its strong power output. The engine produced 279 horsepower at 5700 rpm and 400 Nm (295 lb-ft) of torque at 3900 rpm. Paired with the engine was the 5G-TRONIC automatic transmission, a five-speed unit designed for smooth and refined gear changes. This transmission was electronically controlled, adapting shift points based on driving conditions and throttle input.
Driving Characteristics
The S 420 V8 offered a distinctly grand touring experience. While not overtly sporty, the 4.2-liter V8 provided ample power for effortless cruising and confident overtaking. The 5G-TRONIC transmission, while smooth, was tuned more for comfort than aggressive performance. Compared to the more powerful S 500, the S 420 felt slightly less urgent in its acceleration, taking approximately 8.5 seconds to reach 60 mph. However, this difference was often considered acceptable given the S 420’s lower price point and improved fuel economy. The gear ratios were optimized for relaxed highway driving, with a focus on minimizing engine noise and maximizing passenger comfort. Compared to a manual transmission equipped model (not typically offered on this variant), the automatic provided a more seamless and less engaging driving experience.
Equipment & Trim Levels
The S 420 V8 came standard with a comprehensive list of luxury features, befitting its status as a flagship coupe. Leather upholstery was standard, along with power-adjustable front seats with memory function. Wood trim adorned the interior, adding to the sense of opulence. Standard equipment also included automatic climate control, a premium sound system, and power windows and locks. Optional extras included a sunroof, upgraded leather, a rear seat entertainment system, and various driver assistance features. The exterior typically featured alloy wheels, chrome accents, and a sleek, aerodynamic profile.
Chassis & Braking
The C140 S-Class Coupe featured a robust chassis designed for both comfort and handling. The front suspension utilized coil springs and a double wishbone setup, while the rear employed an independent multi-link suspension with coil springs and a transverse stabilizer bar. This configuration provided a comfortable ride while maintaining good control in corners. Braking duties were handled by ventilated discs on all four wheels, coupled with an Anti-lock Braking System (ABS) for enhanced safety. The steering system was a cone worm with recirculation balls, providing a feel that was precise but not overly communicative.
Market Reception & Comparison
The S 420 V8 was generally well-received by automotive critics. It was praised for its smooth engine, comfortable ride, and luxurious interior. However, some reviewers noted that the performance, while adequate, wasn’t as exhilarating as that of the S 500. Fuel economy, while reasonable for a V8-powered coupe of its size, was still relatively high at around 15.6 l/100 km in urban driving. Compared to the S 320, the S 420 offered a significant power upgrade, justifying its higher price tag for buyers seeking more performance. The S 420 represented a sweet spot in the C140 coupe lineup, offering a compelling blend of luxury, performance, and value.
Legacy
The M119 engine family, including the 4.2-liter variant found in the S 420, is renowned for its durability and longevity. With proper maintenance, these engines can reliably exceed 200,000 miles. The 5G-TRONIC transmission is also generally considered to be a robust unit, although it may require servicing as it ages. Today, the C140 S-Class Coupe, including the S 420 V8, is gaining recognition as a modern classic. Well-maintained examples are sought after by collectors and enthusiasts who appreciate their timeless design, luxurious features, and robust engineering. Finding parts can sometimes be a challenge, but a dedicated aftermarket and a strong community of Mercedes-Benz enthusiasts help to keep these cars on the road.
