The Mercedes-Benz 500 SE, part of the W126 S-Class range produced from September 1985 to September 1987, represented a significant evolution of the flagship sedan. This facelifted version of the W126, internally designated as the SE (Special Equipment) model, offered a blend of luxury, performance, and advanced technology for its time. Positioned as a high-end variant within the S-Class lineup, the 500 SE featured a potent 5.0-liter V8 engine paired exclusively with a four-speed automatic transmission. It served as a statement of engineering prowess and a comfortable grand tourer for the discerning buyer, primarily in European and North American markets.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class SE (W126, facelift 1985) |
| Type (Engine) | 500 SE V8 CAT (223 Hp) Automatic |
| Start of production | September, 1985 |
| End of production | September, 1987 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 15.9 l/100 km (14.8 US mpg, 17.8 UK mpg, 6.3 km/l) |
| Fuel consumption (extra urban) | 9.6 l/100 km (24.5 US mpg, 29.4 UK mpg, 10.4 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8 sec |
| Acceleration 0 – 62 mph | 8 sec |
| Acceleration 0 – 60 mph | 7.6 sec |
| Maximum speed | 220 km/h (136.7 mph) |
| Weight-to-power ratio | 7.3 kg/Hp, 137.7 Hp/tonne |
| Weight-to-torque ratio | 4.4 kg/Nm, 225.3 Nm/tonne |
| Power | 223 Hp @ 4700 rpm |
| Power per litre | 44.8 Hp/l |
| Torque | 365 Nm @ 2500 rpm (269.21 lb.-ft. @ 2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 117 E 50 / 117.965 |
| Engine displacement | 4973 cm3 (303.47 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 96.5 mm (3.8 in.) |
| Piston Stroke | 85 mm (3.35 in.) |
| Compression ratio | 9:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | SOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 13.5 l (14.27 US qt | 11.88 UK qt) |
| Kerb Weight | 1620 kg (3571.49 lbs.) |
| Max. weight | 2140 kg (4717.89 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Length | 5020 mm (197.64 in.) |
| Width | 1820 mm (71.65 in.) |
| Height | 1437 mm (56.57 in.) |
| Wheelbase | 2930 mm (115.35 in.) |
| Front track | 1555 mm (61.22 in.) |
| Rear track | 1527 mm (60.12 in.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 4 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Threaded twist beam |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | Front wheel tires: 205/65 R15Rear wheel tires: 205/65 R15 |
| Wheel rims size | Front wheel rims: 7J x 15Rear wheel rims: 7J x 15 |
Powertrain & Engine Architecture
The heart of the 500 SE was the M117 E 50 engine, a 4.97-liter naturally aspirated V8. This engine, a cornerstone of Mercedes-Benz’s engineering during the era, featured a cast-iron block and aluminum cylinder heads. It employed a single overhead camshaft (SOHC) valvetrain with two valves per cylinder. Fuel delivery was managed by a Bosch K-Jetronic multi-port fuel injection system, known for its reliability and precise metering. The catalytic converter (“CAT” in the model designation) was standard, reflecting increasing emissions regulations. The engine produced 223 horsepower at 4700 rpm and 365 Nm (269.21 lb-ft) of torque at 2500 rpm. The four-speed automatic transmission, a robust unit for its time, was the sole transmission option. It was designed to provide smooth and comfortable shifts, prioritizing luxury over outright performance.
Driving Characteristics
The 500 SE Automatic offered a refined and comfortable driving experience. While not as overtly sporty as some of its competitors, the V8 engine provided ample power for effortless cruising and confident overtaking. The automatic transmission, while smooth, wasn’t particularly quick to downshift, resulting in a slightly less responsive feel compared to the manual transmission options available in other S-Class models. Acceleration from 0 to 60 mph took around 7.6 seconds, and the car had a top speed of 220 km/h (136.7 mph). The emphasis was on providing a relaxed and luxurious ride, absorbing bumps and imperfections in the road with ease. The gear ratios were tuned for comfortable highway cruising, with a focus on minimizing engine noise and maximizing fuel efficiency (relative to the engine’s size and the era).
Equipment & Trim Levels
The “SE” designation indicated a higher level of standard equipment. The 500 SE typically included features such as leather upholstery, power-adjustable front seats, climate control, power windows, central locking, and an upgraded sound system. Optional extras included a sunroof, heated seats, and a more sophisticated audio system. The interior was characterized by its high-quality materials and meticulous craftsmanship, reflecting Mercedes-Benz’s commitment to luxury. The dashboard layout was functional and elegant, with clearly labeled controls and a focus on driver ergonomics.
Chassis & Braking
The W126 S-Class featured a robust chassis with independent suspension at the front (double wishbone) and a threaded twist beam rear suspension. This setup provided a comfortable ride and good handling characteristics. The 500 SE was equipped with ventilated disc brakes at the front and solid disc brakes at the rear. An Anti-lock Braking System (ABS) was standard, enhancing safety and stability during hard braking. The steering was a recirculating ball system with hydraulic power assistance, providing a comfortable and precise steering feel.
Market Reception & Comparison
The 500 SE was generally well-received by automotive critics. It was praised for its luxurious interior, comfortable ride, and powerful engine. However, some critics noted that the automatic transmission could feel a bit sluggish compared to manual options. Compared to the 300 SE and 420 SE, the 500 SE offered significantly more performance and a more prestigious image. Fuel economy, while acceptable for a V8 of that era, was considerably lower than the six-cylinder models. Reliability was generally good, although the complex fuel injection system required regular maintenance.
Legacy
The W126 S-Class, including the 500 SE, is now considered a classic Mercedes-Benz. The M117 engine is known for its durability and longevity, and well-maintained examples can still provide reliable service today. The 500 SE, in particular, is sought after by collectors and enthusiasts who appreciate its combination of luxury, performance, and classic styling. While maintenance costs can be higher than more modern vehicles, the W126 S-Class remains a rewarding ownership experience for those who value engineering excellence and timeless design. The car represents a high point in Mercedes-Benz engineering and a benchmark for luxury sedans of its time.
