The Mercedes-Benz S-Class Long (V140) 300 SE, produced from 1991 to 1993, represented a significant evolution in luxury sedan design and technology. Positioned as a mid-range offering within the extended wheelbase (Long) V140 S-Class lineup, the 300 SE combined a refined inline-six engine with a five-speed automatic transmission, aiming to deliver a balance of performance, comfort, and fuel efficiency. The V140 generation, replacing the W126, was notable for its increased size, advanced safety features, and a more contemporary aesthetic, solidifying Mercedes-Benz’s reputation for engineering excellence. This particular variant was primarily aimed at buyers who desired the prestige of the S-Class and the added space of the long wheelbase, but didn’t require the higher performance of the V8-powered models.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V140) |
| Type (Engine) | 300 SE (231 Hp) |
| Start of production | 1991 year |
| End of production | 1993 year |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 17.6 l/100 km (13.4 US mpg, 16.1 UK mpg, 5.7 km/l) |
| Fuel consumption (economy) – extra urban | 9.5 l/100 km (24.8 US mpg, 29.7 UK mpg, 10.5 km/l) |
| Fuel consumption (economy) – combined | 11.6 l/100 km (20.3 US mpg, 24.4 UK mpg, 8.6 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.9 sec |
| Acceleration 0 – 62 mph | 8.9 sec |
| Acceleration 0 – 60 mph | 8.5 sec |
| Maximum speed | 230 km/h (142.92 mph) |
| Weight-to-power ratio | 8.2 kg/Hp, 121.6 Hp/tonne |
| Weight-to-torque ratio | 6.1 kg/Nm, 163.2 Nm/tonne |
| Power | 231 Hp @ 5800 rpm |
| Power per litre | 72.2 Hp/l |
| Torque | 310 Nm @ 4100 rpm (228.64 lb.-ft. @ 4100 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 104 E 32/104.990 |
| Engine displacement | 3199 cm3 (195.21 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 89.9 mm (3.54 in.) |
| Piston Stroke | 84 mm (3.31 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Coolant | 14.5 l (15.32 US qt | 12.76 UK qt) |
| Kerb Weight | 1900 kg (4188.78 lbs.) |
| Max. weight | 2420 kg (5335.19 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Trunk (boot) space – minimum | 525 l (18.54 cu. ft.) |
| Fuel tank capacity | 100 l (26.42 US gal | 22 UK gal) |
| Permitted trailer load with brakes (12%) | 1900 kg (4188.78 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 5213 mm (205.24 in.) |
| Width | 1886 mm (74.25 in.) |
| Height | 1492 mm (58.74 in.) |
| Wheelbase | 3140 mm (123.62 in.) |
| Front track | 1602 mm (63.07 in.) |
| Rear (Back) track | 1574 mm (61.97 in.) |
| Minimum turning circle | 12.18 m (39.96 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Worm-reduction unit |
| Power steering | Hydraulic Steering |
| Tires size | 235/60 R16 |
| Wheel rims size | 7.5J x 16 |
Powertrain & Engine Architecture
The 300 SE was powered by the M104.990 3.2-liter inline-six engine. This engine was a significant departure from the earlier Mercedes-Benz six-cylinder designs, featuring all-aluminum construction, a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, and a Bosch multi-port fuel injection system. The M104 was known for its smooth operation, relatively high specific output, and good refinement. The engine produced 231 horsepower at 5800 rpm and 310 Nm (228.64 lb-ft) of torque at 4100 rpm. Paired with a five-speed automatic transmission (typically the 5G-Tronic), the powertrain delivered comfortable and predictable performance. The automatic transmission was designed for smooth shifts and optimized for fuel economy, rather than outright acceleration.
Driving Characteristics
The 300 SE Automatic offered a relaxed and refined driving experience. While not a sports sedan, the engine provided adequate power for comfortable highway cruising and city driving. Acceleration from 0-60 mph took approximately 8.5 seconds, and top speed was electronically limited to 230 km/h (143 mph). The automatic transmission, while smooth, did contribute to a slight reduction in responsiveness compared to the available manual transmission. Gear ratios were tuned for fuel efficiency and comfort, meaning the engine didn’t always feel as eager to rev as it could. The long wheelbase and sophisticated suspension provided a comfortable ride, absorbing bumps and imperfections in the road effectively.
Equipment & Trim Levels
The 300 SE Long came standard with a comprehensive list of luxury features, including leather upholstery, power-adjustable front seats with memory function, automatic climate control, a high-end audio system, and power windows and locks. Wood trim adorned the interior, enhancing the sense of luxury. Optional extras included a sunroof, upgraded audio systems, rear seat entertainment, and various exterior cosmetic enhancements. The “SE” designation (Sonderausstattung – Special Equipment) indicated a higher level of standard equipment compared to the base model.
Chassis & Braking
The V140 S-Class featured a robust chassis with double wishbone front suspension and an independent multi-link rear suspension. This setup provided a comfortable ride and good handling characteristics. The 300 SE was equipped with ventilated disc brakes on all four wheels and an Anti-lock Braking System (ABS) as standard, ensuring confident stopping power. Steering was handled by a hydraulic power steering system, providing a light and precise feel. The car rode on 235/60 R16 tires mounted on 7.5J x 16 inch alloy wheels.
Market Reception & Comparison
The 300 SE Long was generally well-received by automotive critics. It was praised for its luxurious interior, comfortable ride, and refined engine. However, some reviewers noted that the automatic transmission could feel somewhat sluggish, and the car’s size made it challenging to maneuver in tight spaces. Compared to the 300 TE (wagon) or the higher-performance 400 SE and 500 SE models, the 300 SE offered a more balanced proposition, appealing to buyers who prioritized comfort and fuel economy over outright performance. The 300 SE also offered a more affordable entry point into the S-Class range.
Legacy
The M104 engine, found in the 300 SE, proved to be a durable and reliable powerplant. With proper maintenance, these engines can accumulate high mileage without major issues. The V140 S-Class, as a whole, is considered a landmark vehicle in automotive history, representing a high point in Mercedes-Benz engineering and luxury. Today, well-maintained 300 SE Long models are sought after by collectors and enthusiasts, offering a comfortable and stylish classic car experience. While parts availability can be a concern, the M104 engine’s robust design and the V140’s overall build quality ensure that these cars remain on the road for years to come.
