Mercedes-Benz 300 SL Roadster (W198 II)

Mercedes-Benz 300 SL Roadster (W198 II)

The Mercedes-Benz 300 SL Roadster, designated W198 II, arrived in 1957 as the successor to the iconic Gullwing coupe. While the Gullwing is often considered the more dramatic car, many enthusiasts and collectors regard the Roadster as the superior automobile. Its development addressed the Gullwing's known shortcomings while preserving — and in some cases enhancing — the extraordinary mechanical specification that made the 300 SL one of the most advanced production cars of its era.

The Roadster retained the Gullwing's magnificent 3.0-liter inline-six engine with Bosch mechanical direct fuel injection, a technology pioneered by Mercedes-Benz for production car use. This was not port injection but true direct injection, with fuel sprayed directly into each combustion chamber — a technology so advanced that it would not become mainstream for another four decades. Output was 215 horsepower in standard tune, with an optional sport camshaft raising the figure to 235 horsepower. The engine was canted 50 degrees to the left to accommodate the low hood line, a design requirement inherited from the original racing W194.

The most significant engineering change was the rear suspension. The Gullwing's notorious high-pivot swing axle, which could induce dramatic oversteer when the rear end jacked up during hard cornering, was replaced with a new low-pivot swing axle design. This geometry change dramatically improved handling predictability and safety, making the Roadster a more forgiving and ultimately faster car on winding roads. The improvement was so significant that Mercedes-Benz later offered the updated suspension as a retrofit for Gullwing owners.

The body structure was extensively redesigned. Where the Gullwing required its upward-opening doors because the spaceframe chassis rails ran high along the door sills, the Roadster featured modified frame rails that dropped lower, permitting conventional front-hinged doors. A folding soft top and an optional removable hardtop provided weather protection. The body panels were steel, with aluminum hood, trunk lid, and door skins to save weight.

Inside, the Roadster offered more refined accommodations than the spartan Gullwing. The dashboard featured a more comprehensive instrument layout, and the seats were better shaped for long-distance touring. Luggage space improved measurably with the redesigned body. The car was clearly positioned as a grand tourer rather than a thinly disguised racing car.

Throughout its production run from 1957 to 1963, the 300 SL Roadster received continuous improvements. Later cars gained disc brakes in 1961, replacing the original drums — a welcome upgrade for a car capable of 155 mph. An optional aluminum engine block was available, saving approximately 40 kilograms. A factory hardtop became a popular option for year-round use.

Total production reached 1,858 units over seven years, considerably more than the Gullwing's 1,400 but still a rare car by any standard. Early drum-brake Roadsters are the most common, while the late disc-brake cars with aluminum engine blocks represent the most evolved and desirable specification. Values have historically been slightly below the Gullwing but have climbed steadily, with exceptional examples commanding over $2 million.

The 300 SL Roadster represents the pinnacle of 1950s automotive technology in an open-top package. Its direct fuel injection, advanced chassis engineering, and elegant styling create an experience that remains compelling nearly seven decades after its introduction. For those who prioritize driving experience over visual drama, many consider the Roadster the finer 300 SL.