The Mercedes-Benz S-Class (W140) 300 SE, produced from 1991 to 1993, represented a significant step forward in luxury and technology for the German automaker. Positioned as an entry point into the flagship S-Class range, the 300 SE offered a blend of performance and comfort, appealing to buyers seeking prestige without the higher price tag of the V8-powered models. It was a key component of the W140 generation, which aimed to establish a new benchmark for automotive engineering and refinement. The W140 platform, internally known as the 140 series, was a substantial redesign, replacing the W126 and introducing a host of innovations that would trickle down to other Mercedes-Benz vehicles.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class (W140) |
| Type | 300 SE (231 Hp) Automatic 4-speed |
| Start of production | 1991 |
| End of production | 1993 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (combined) | 12.3 l/100 km |
| Fuel consumption (US mpg) | 19.1 US mpg |
| Fuel consumption (UK mpg) | 23 UK mpg |
| Fuel consumption (km/l) | 8.1 km/l |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.6 sec |
| Acceleration 0 – 62 mph | 8.6 sec |
| Acceleration 0 – 60 mph | 8.2 sec |
| Maximum speed | 225 km/h (139.81 mph) |
| Weight-to-power ratio | 8.2 kg/Hp |
| Weight-to-torque ratio | 6.1 kg/Nm |
| 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 capacity | 14.5 l (15.32 US qt | 12.76 UK qt) |
| Kerb Weight | 1890 kg (4166.74 lbs.) |
| Max. weight | 2410 kg (5313.14 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) |
| Length | 5113 mm (201.3 in.) |
| Width | 1886 mm (74.25 in.) |
| Height | 1492 mm (58.74 in.) |
| Wheelbase | 3040 mm (119.69 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 |
| Number of gears | 4 |
| Gearbox type | automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| 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 V8s traditionally associated with the S-Class, representing a move towards more fuel-efficient options. The M104 featured a double overhead camshaft (DOHC) valvetrain, four valves per cylinder, and multi-port fuel injection. These features contributed to its relatively high output of 231 horsepower and 229 lb-ft of torque. The engine’s design prioritized smoothness and refinement, characteristics highly valued in the luxury segment. Paired with the engine was a four-speed automatic transmission, designed for seamless gear changes and a comfortable driving experience. This transmission was a conventional hydraulic automatic, lacking the electronic controls found in later Mercedes-Benz transmissions.
Driving Characteristics
The 300 SE Automatic offered a comfortable and refined driving experience, but it wasn’t particularly sporty. The four-speed automatic transmission, while smooth, lacked the responsiveness of a manual gearbox or the more advanced automatic transmissions available in higher-end S-Class models. Acceleration from 0 to 60 mph took around 8.2 seconds, which was adequate for the time but not particularly quick. The engine delivered its power smoothly throughout the rev range, but it lacked the punch of the V8 engines. The focus was on providing a relaxed and effortless cruising experience, making it well-suited for long highway journeys. The gear ratios were optimized for fuel economy and comfort rather than outright performance.
Equipment & Trim Levels
The 300 SE came standard with a comprehensive list of features expected of a luxury sedan. This included leather upholstery, power-adjustable front seats, climate control, a high-quality sound system, and power windows and locks. Optional extras included a sunroof, upgraded sound systems, and rear climate control. The interior design was characterized by its understated elegance and high-quality materials. The dashboard layout was functional and easy to use, with a focus on providing the driver with clear and concise information. While not as lavishly equipped as the 400 SE or 500 SE, the 300 SE offered a comfortable and well-appointed interior.
Chassis & Braking
The W140 S-Class featured a robust chassis with double wishbone suspension at the front and an independent multi-link suspension at the rear. This suspension setup provided a comfortable ride and good handling characteristics. The 300 SE was equipped with ventilated disc brakes at the front and solid disc brakes at the rear. Anti-lock braking system (ABS) was standard, enhancing safety and control during emergency braking situations. The steering was hydraulic power steering, providing light and effortless steering feel. The suspension was tuned for comfort, prioritizing a smooth ride over sporty handling.
Market Reception & Comparison
The 300 SE was generally well-received by critics, who praised its comfortable ride, refined engine, and luxurious interior. However, some critics noted that it lacked the performance of the V8-powered models. Compared to the 400 SE and 500 SE, the 300 SE offered a more affordable entry point into the S-Class range, but it came with a trade-off in terms of performance. Fuel economy was a strong point for the 300 SE, making it a more practical choice for buyers who prioritized efficiency. Reliability was generally good, although the W140 S-Class was known for its complex systems, which could be expensive to repair.
Legacy
The W140 S-Class 300 SE remains a sought-after classic car today, particularly among Mercedes-Benz enthusiasts. The M104 engine is known for its durability and reliability, and well-maintained examples can still provide years of trouble-free service. While the 300 SE may not be the fastest or most powerful S-Class variant, it offers a unique combination of luxury, comfort, and affordability. Its status in the used car market is generally strong, with prices varying depending on condition and mileage. The W140 generation, as a whole, is remembered for its over-engineered build quality and its role in establishing Mercedes-Benz as a leader in automotive innovation.
