Concepts · 2007
Four doors. No roof. No equal.
In the coldest week of a Detroit winter, Mercedes rolled out a champagne-colored V12 convertible with four doors — something it hadn't built since 1962, and something nobody has built since.
Detroit, January 2007. The Mercedes press conference has a dogsled team, hockey players and figure skaters on ice — a hundred years of the Detroit show, a hundred years of Mercedes all-wheel drive. Then, from nowhere in the winter theater, a red carpet unrolls and onto it glides a long, low, four-door convertible the color of champagne, top down, in January, in Michigan.
That was the point. “We thought Detroit was a good place to show such a car,” said Hans-Dieter Futschik, the design director responsible for it. “It’s cold there in winter, and it’s not nice weather. The idea was to show a car that you drive in sunshine and open wind.” The Concept Ocean Drive — named after Miami’s most famous seafront street — was a dream staged in the one city that needed it most.
The last four-door convertible Mercedes left the line in 1962
45 years
Between the last built-to-order 300 d Cabriolet and the Ocean Drive, an entire genre disappeared. The last series-production four-door convertible from anyone, anywhere, was the 1967 Lincoln Continental.
Chapter I
A genre that died with the fifties.
There was a time when the grandest car you could buy had four doors and no roof: the parade cars and state convertibles of the thirties, forties and fifties. Mercedes kept the tradition alive longest of all — the vast 300 Cabriolet D, the open four-door version of the “Adenauer” flagship, was built to order in Stuttgart until 1962.
Then it simply stopped. Unitary bodies made pillarless four-door convertibles brutally hard to keep stiff, safety regulations multiplied, and the segment vanished so completely that by 2007 two generations of buyers had never seen one new.
“People have been asking for a four-door convertible for some time,” Futschik said in Detroit. “So the idea was there, and we took the opportunity to realize a concept.” His team drew inspiration from the great American convertibles — Cadillacs of the fifties and sixties — but the brief was forward-looking, not nostalgic.
Design chief Peter Pfeiffer was blunt about it: “The Ocean Drive concept is not looking back into the history books at all; we wanted to create a dream.” The exterior came from Mercedes’ studio in Yokohama, Japan; the interior from its studio in Como, Italy. A dream, engineered on three continents.
Chapter II
A real car in a show car’s gown.
Under the champagne-and-mocha paint sat the long-wheelbase S 600: its 5.5-liter biturbo V12, its five-speed automatic, its Active Body Control suspension, even its radar-based braking assistants. The engineers stripped the flagship to its floor assembly, left only a stump of each B-pillar, laced the platform with concealed cross-bracing, and dressed it in an all-new carbon fiber body — the rear doors slightly shortened to clear the folding top.
Almost nothing you could see or touch came from the donor car — Mercedes said only the instruments and switchgear carried over. A wood-rimmed steering wheel with a polished aluminum star, a one-off chronometer in the dash, video screens in the front head restraints, AIRSCARF neck-level heating in all four single seats — and between the rear seats, a chilled compartment holding one bottle of champagne and two goblets, with grips to hold them steady while the car is moving.
- Engine
- V12
- Power
- 517 PS
- Torque
- 830 N·m
- Length
- 5.29 m
“All the switches connect to real machinery that does what the switch icon promises. I’ve driven pre-production prototypes that were built worse than this.”
The name
Ocean Drive.
Not a chassis code, not an alphanumeric — a street. The seafront strip of Miami’s South Beach, all art deco neon and warm evening air, was exactly the world this car was drawn for: the “topless” cruise along the world’s finest ocean promenades that the press release promised. Even the paint played along — a color-shifting two-tone finish that had to pass through the paint shop twice.
Chapter III
Twenty seconds of choreography.
The hardest engineering on the car was the part designed to disappear. The soft top measured 2,182 millimeters from windshield header to tail, arcing over roughly 3.2 square meters — one of the largest convertible roofs ever attempted — with a 30-millimeter layer of padding and a light-colored headliner to keep the closed cabin airy.
Folding something that size elegantly took a world first: the hydraulic mechanism was governed by six proportional valves, which let the different phases of the fold run at different speeds and in parallel rather than one after another. The trunk lid swings backward, the parcel shelf rises, the roof stacks itself away — in about 20 seconds, without the usual transverse seam.
Even the fabric was designed twice over. Its warp and weft threads were woven in lighter and darker shades, so the closed top shimmered matt and glossy by turns — deliberately echoing the color-shifting paint beneath it.
With the top stowed, its cover doubled as the parcel shelf — finished, like the shoulder line all around the cabin, in bird’s-eye maple, one of the most expensive veneers there is. Roof up or roof down, there was no state in which the Ocean Drive looked unfinished. For a one-off, that is almost unheard of.
Chapter IV
“Two to four weeks.”
Detroit loved it. The press called it production-ready; Autoweek reported that Stuttgart would build some version of it if the reaction was strong enough. Asked directly, Pfeiffer went further than concept-car executives ever do: “We are going to make a decision whether to build the Ocean Drive or not in the next two to four weeks.”
The weeks passed. Whatever was decided in Stuttgart was never announced; within eighteen months the industry had fallen into its deepest crisis in decades, and a hand-built four-door flagship convertible was no longer a conversation anyone was having. The open S-Class did eventually arrive — the A217 Cabriolet of 2015 — but with two doors, not four.
What shipped — and what still hasn’t
Ocean Drive ideas in later production cars
- Large upright grille
- 2007 · C-Class (W204) onward
- Two-tone paintwork
- 2015 · Mercedes-Maybach S-Class
- Open S-Class
- 2015 · S-Class Cabriolet (A217) — two doors
- Four-door convertible
- — · Still nobody builds one
Epilogue
Still the last of its kind.
Pieces of the Ocean Drive shipped anyway. Pfeiffer promised in Detroit that its huge, three-dimensional upright grille would appear “on the new C-Class and other future models” — and it did, within the year. The elaborate two-tone paint he said “will happen” became a signature of Mercedes-Maybach. AIRSCARF spread across the convertible range. The one idea that never shipped was the car itself.
The one-off still exists, surfacing now and then at Mercedes-Benz heritage exhibitions — a fully working, fully trimmed answer to a question no automaker has asked again. Nearly two decades on, the newest four-door convertible in the world is still a concept car from 2007.