Description
The Mercedes-Benz 320 Cabriolet D 3.4 was the most spacious and formal open-top model of the late W142 series, introduced when Mercedes-Benz enlarged the original 3.2-litre straight-six to 3.4 litres. This final evolution brought stronger torque, smoother cruising ability and improved refinement, making the Cabriolet D 3.4 the pinnacle of the W142 four-door cabriolet range. With its imposing presence, generous interior space and exceptional craftsmanship from the Sindelfingen coachworks, it became one of the most dignified and luxurious pre-war touring cars produced by Mercedes-Benz.
The 3.4-litre inline-six produced approximately 79–80 horsepower, but the true benefit of the enlarged engine lay in its deeper, smoother torque delivery. It allowed the car to accelerate more confidently, maintain higher speeds with less effort and carry passengers with greater ease on long journeys. The four-speed manual gearbox, featuring synchromesh on the upper gears, complemented the engine’s relaxed character and made the large open tourer more pleasant to drive in varied conditions. Even with its considerable size and weight, the Cabriolet D 3.4 moved with an effortless, unhurried refinement that defined Mercedes-Benz luxury at the end of the 1930s.
Built on the long-wheelbase W142 chassis, the Cabriolet D provided the space necessary for a full four-door configuration. The box-section frame gave the car the rigidity required for its large open body, while the suspension system—independent front wheels with coil springs and a swing-axle rear layout—ensured a cushioned and controlled ride. Hydraulic brakes on all four wheels provided dependable stopping capability, a valuable advancement over the earlier mechanical systems. The long wheelbase contributed to exceptional stability on the road, allowing the car to glide over uneven surfaces with a smooth, stately quality that suited its formal appearance.
The Sindelfingen-designed body was distinguished by dignified proportions and an unmistakably prestigious silhouette. The long bonnet, sweeping fenders and tall passenger compartment created an impressive profile, while four wide-opening doors made entry and exit easy for all occupants. The large folding roof, crafted from high-quality fabric, provided excellent coverage when raised and folded neatly behind the rear seats when lowered. With the roof up, the Cabriolet D resembled a formal limousine; with the roof down, it transformed into a grand and imposing open tourer suitable for scenic travel or ceremonial use. The clean, flowing lines and restrained use of chrome detailing reflected the understated elegance of late-1930s Mercedes design.
Inside, the Cabriolet D 3.4 offered a spacious and comfortable cabin capable of seating four adults with ease. The long wheelbase ensured generous legroom, especially in the rear compartment, making the car well suited to chauffeur-driven duties or luxurious family touring. Upholstery was finished in high-quality leather or cloth depending on customer preference, and the interior featured polished wood or carefully finished metal trim. The dashboard housed clear and logically arranged instruments, contributing to an atmosphere of refined craftsmanship. With the roof lowered, the interior became bright and open; with the roof raised, it remained sheltered, warm and suitably formal.
On the road, the 320 Cabriolet D 3.4 delivered a calm, composed and exceptionally comfortable driving experience. The enlarged engine provided stronger and more flexible performance than earlier versions, allowing the car to cruise effortlessly for long distances. The suspension absorbed bumps and road imperfections with ease, and the hydraulic brakes inspired confidence. The long wheelbase and substantial weight produced a smooth, floating ride that suited the car’s ceremonial and touring roles. It was not a sporting machine but instead excelled as a refined grand tourer and prestige vehicle.
The 3.4-litre Cabriolet D represented the most advanced and desirable open four-door model within the W142 series. It appealed to affluent private owners, institutions and clients who required a luxurious open-top vehicle with formal presence and modern mechanical refinement. Production numbers were low, as the car was expensive and built during the uncertain years leading up to the Second World War.
Today, the Mercedes-Benz 320 Cabriolet D 3.4 is considered one of the most collectible and architecturally impressive pre-war Mercedes-Benz models. Its combination of elegant design, smooth six-cylinder power, spacious four-door layout and rare late-series 3.4-litre specification makes it a prized example of Sindelfingen craftsmanship. Surviving cars stand as superb representations of Mercedes-Benz luxury engineering at its height on the eve of the war, and they remain sought after for their beauty, presence and historical importance.