Description
The Mercedes-Benz 300 D introduced in 1984 was part of the W124 generation and represented one of the most refined diesel saloons Mercedes-Benz had produced up to that point. By the late 1980s, the company had largely overcome the traditional drawbacks of diesel passenger cars, and the 300 D stood as a clear example of how economy, longevity and everyday usability could be combined with genuine comfort and composure.
Power came from a 3.0-litre inline six-cylinder diesel engine in naturally aspirated form, producing approximately 110 horsepower. This engine marked a significant refinement over earlier five-cylinder diesels, offering smoother operation, reduced vibration and stronger overall torque delivery. While still not a performance car, the 300 D provided confident real-world acceleration and was well suited to sustained motorway cruising. Buyers could choose between a five-speed manual gearbox and a four-speed automatic transmission, with the automatic being especially popular for its relaxed and effortless character.
The W124 platform gave the 300 D a sophisticated and well-balanced chassis. Compared with the W123, the body was more aerodynamic, improving fuel efficiency and reducing wind noise at speed. Structural rigidity was high, with a strong passenger safety cell and carefully engineered crumple zones. Suspension consisted of struts at the front and a multi-link rear axle, a major technical advancement that significantly improved ride comfort, stability and traction across a wide range of road conditions.
Styling of the 1987 Mercedes-Benz 300 D was clean, restrained and modern without being fashionable. The smooth body surfaces and lower profile marked a clear departure from earlier upright designs, while still maintaining a conservative and professional appearance. The design emphasised proportion and function, contributing to a timeless look that has aged particularly well.
Inside, the cabin reflected Mercedes-Benz’s continued focus on ergonomics and durability. Materials were high quality and designed for long-term use, with solid switchgear and excellent fit and finish. Seating was firm and supportive, ideal for long-distance driving, and sound insulation was improved compared with earlier diesel models. Although diesel characteristics were still present at idle, refinement at cruising speeds was excellent for the era.
On the road, the Mercedes-Benz 300 D delivered a calm, confident and reassuring driving experience. The six-cylinder diesel engine provided smooth, flexible power, while the advanced suspension ensured excellent stability and comfort even at higher speeds. Steering was precise and well weighted, encouraging relaxed and controlled driving rather than aggression. The car excelled as a long-distance cruiser, where its balance of economy, comfort and refinement became most apparent.
The 300 D appealed to professionals, fleet users and private owners who covered high annual mileages and demanded reliability without sacrificing comfort. It was widely respected for its mechanical robustness, and many examples accumulated very high mileages with routine maintenance, reinforcing Mercedes-Benz’s reputation during this period.
Today, the 1987 Mercedes-Benz 300 D is regarded as one of the most complete diesel saloons of its era. It represents the point at which diesel refinement truly met executive-class comfort, making it a significant model in Mercedes-Benz history. Valued for its smooth six-cylinder engine, advanced chassis and understated design, the 300 D stands as a respected and increasingly appreciated modern classic from the W124 generation.