The pre-war German grand tourer — supercharged straight-eight luxury with Sindelfingen-built coachwork of unmatched theatre.
The 500K (1934–1936) and its replacement 540K (1936–1940) were the flagship Mercedes-Benz sports tourers of the 1930s. Each carried a supercharged straight-eight (5,018cc / 5,401cc) producing 100–115 bhp normally and 160–180 bhp with the blower engaged. The factory's Sindelfingen coachworks produced a range of bodies, of which the Special Roadster — long bonnet, sweeping rear fenders, single side-mounted spare — became the most celebrated. Roughly 354 540Ks were built in all body styles, and only around 26 Special Roadsters.
Some of the most theatrical and valuable pre-war cars; Special Roadsters routinely top concours fields globally.
| Variant | Years | Production | Notes |
|---|---|---|---|
| 500K | 1934–1936 | Not separately recorded | 5,018cc supercharged eight; predecessor of 540K. |
| 540K Special Roadster | 1936–1940 | 26 | Most celebrated body style; concours mainstay. |
| 540K Cabriolet A / B / C | 1936–1940 | Not separately recorded | Various Sindelfingen open and convertible bodies. |
The models below represent the most significant limited and special edition variants — factory-produced cars that command meaningful premiums over standard examples and warrant specific attention from serious collectors.
For pre-war and vintage cars such as the Mercedes-Benz 500K / 540K, provenance is paramount. Chassis and engine number matching, period coachbuilder records, factory build sheets where available, continuous ownership documentation, original handbooks and any competition or concours history are the foundation of value. Sindelfingen body type, original chassis-body pairing per factory build sheet, Mercedes-Benz Classic Centre documentation and concours-recognised provenance.
The supercharged inline-eight is robust if blower-engagement discipline is maintained; rebuild is a specialist undertaking and parts come through Mercedes-Benz Classic Centre and a small number of independent shops. A pre-purchase inspection by a recognised marque specialist should include compression and leak-down testing, magneto and ignition checks, chassis straightness and frame survey, axle and steering wear assessment, brake system review (mechanical or hydraulic per period), and an extended road test on varied terrain to expose carburation, cooling and gearbox issues that only emerge under sustained running.
Pre-war coachwork is rarely truly original after a century of use. Establish whether the body is original to the chassis (period photographs, build records, coachbuilder plates), whether it has been re-bodied at any point, and the standard of any restoration. Quality of timber framing, ash health, panel beating and paint depth are all critical. Concealed structural rot, re-bodies presented as original, and 'tribute' cars built on later or unrelated chassis must be priced accordingly.
Sindelfingen Special Roadster lead the market by a wide margin; Cabriolet A, B and C bodies follow, with closed coupes trailing despite often having matching mechanicals. For vintage cars, event eligibility — Mille Miglia, Goodwood Revival, Pebble Beach, VSCC events, Le Mans Classic — can underwrite a substantial proportion of market value. Verify FIA/FIVA papers, period race history where claimed, and the car's standing with the relevant marque registry before purchase.
| Date | Auction | Car | Mileage | Result |
|---|---|---|---|---|
| 2026-01-30 | Bonhams The Paris Sale | 1934 500K (Lot 127) | — | €862,500 Sold |
| 2025-08-15 | RM Sotheby's Monterey | 1935 500K Special Roadster (Lot 237) | — | $5,340,000 Sold |
| 2025-02-27 | RM Sotheby's Miami | 1937 540K Cabriolet A (Lot 269) | — | $2,920,000 Sold |
| 2024-10-26 | RM Sotheby's The Junkyard: The Rudi Klein Collection | 1935 500K 'Caracciola' Special Coupe (Lot 299) | — | $4,130,000 Sold |
| 2024-03-01 | RM Sotheby's Amelia Island | 1939 540K Special Cabriolet A (Lot 148) | — | $2,205,000 Sold |
The Special Roadster is one of the most desirable cars on Earth; even Cabriolet B/C bodies have meaningful upside.
Our view, not advice. This section is Car Collector International's editorial judgement on where this model sits in the collector market, based on the production, specification and market data set out in this guide. It is not a recommendation to buy or sell and it is not investment advice. Values can fall as well as rise.
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The valuation figures in this guide are for research purposes only and do not constitute financial or investment advice. See our full disclaimer.
