BMW 507 vs. Mercedes-Benz 300 SL: Why the ‘Flop’ Outsells the Icon

Two Icons, Two Fates: Setting the Scene (1954-1959)

In 1954, Max Hoffman, the New York importer who talked Porsche and Mercedes-Benz into building cars Americans actually wanted, pitched BMW on a two-seat grand tourer to compete with the Mercedes-Benz 300 SL. Hoffman knew the American market. He’d already convinced Mercedes-Benz to build a road-going version of its W194 race car, and that car became the Gullwing. BMW, still rebuilding after the war and desperate for a halo product, said yes to a similar bet on the 507.

By 1955 the BMW 507 debuted at Frankfurt to genuine acclaim. Production ran from 1956 to 1959. Mercedes-Benz, meanwhile, had already been building the 300 SL coupe since 1954 and would extend the line into a roadster through 1963. Same market, same decade, same German engineering pedigree. One company made money. One nearly went under. Seventy years later, the math has flipped, and understanding why matters more to a collector or lender than either car’s original spec sheet.

The Mercedes-Benz 300 SL: Engineering the Benchmark

The Mercedes-Benz 300 SL earned its reputation through motorsport lineage. The road car (chassis code W198) was a direct descendant of the W194 racer, and it became the world’s first series-production car fitted with mechanical direct fuel injection, a technology Mercedes-Benz borrowed from wartime aircraft engines, according to Wikipedia’s entry on the Mercedes-Benz 300 SL. That injection system let the 3.0-liter SOHC inline-six make 220 hp at 6,100 rpm in period testing, enough for a 0-60 mph run of 7.7 seconds and a 138 mph top speed, according to Car and Driver‘s retest of a 1956 example, “Tested: 1956 Mercedes-Benz 300SL Is Automotive Brilliance.”

Mercedes-Benz built roughly 1,400 Gullwing coupes, and the combined W198 total across coupe and roadster body styles reached approximately 3,258 cars, per Wikipedia. That volume, unheard of for a car with race-bred engineering and a body style that required engineers to hinge the doors from the roof because the tubular space frame made conventional doors impossible, is exactly why the 300 SL turned a profit. Mercedes-Benz priced it high, at $7,463 base and $9,300 as tested in the Car and Driver piece, but sold enough of them that the car funded itself and burnished the brand for a generation.

The BMW 507: A Beautiful Failure

The BMW 507 did everything the brief asked of it, aesthetically and mechanically, and still nearly sank the company. As Car & Classic puts it in its buyer’s guide, the 507 “succeeded on every aesthetic and engineering measure, yet it failed commercially, with near-fatal consequences for the company.”

The car itself was no compromise. A 3.2-liter all-aluminum V8, fed by dual Zenith carburetors, produced around 150 hp at 5,000 rpm and 173 lb-ft of torque, mated to a 4-speed manual sending power to the rear wheels, per Wikipedia and Autoevolution’s spec sheet for the 1956 BMW 507 TS Coupe. At roughly 3,230 lb, it was lighter on paper than heavy German luxury cars of the era but still hauled around drum brakes front and rear, a detail that mattered on the autobahn and matters even more to a modern restorer sourcing parts. The styling, penned under Count Albrecht von Goertz, was so resolved that it attracted Elvis Presley, Alain Delon, and Ursula Andress as private owners, according to Car & Classic. None of that saved BMW’s balance sheet. Only 252 production cars plus 2 prototypes ever left the factory, and the losses on the program contributed directly to the financial crisis that nearly forced BMW into a takeover by Daimler-Benz at the end of the decade.

Head-to-Head: Performance and Specifications

On paper, these two cars are closer than their commercial fates suggest. The Mercedes-Benz 300 SL has more horsepower, a quicker sprint to 60, and a production run more than twelve times larger than the BMW 507’s. The 507’s V8 gives up 70 hp to the SL’s inline-six, and its drum brakes trail the SL’s more advanced setup. The gap in weight, roughly 375 lb in the 300 SL’s favor, explains most of the performance delta.

Sources for the 507’s performance figures vary by test conditions and gearing option: Car & Classic cites the wider 124-141 mph range and 8.8-11.0 second 0-60 window, while Autoevolution’s single period test recorded 139.5 mph and a 10.6 second 0-62 mph run. That spread itself tells you something: far fewer 507s were tested and documented in period than 300 SLs, because far fewer existed to test. With only 252 production cars ever built against roughly 1,400 Gullwing coupes, even the surviving test data is scarcer for the BMW, which is part of why specialist appraisal matters more for this model than for most collector cars of its era.

Rarity by the Numbers: Why Fewer Isn’t Always Cheaper, Except When It Is

Rarity alone doesn’t set a price floor. It sets the ceiling on how many buyers can ever compete for the asset, which is a different thing entirely, and it only becomes a valuation driver when demand already exists independent of supply.

The raw numbers are stark. BMW built 252 production 507s. Mercedes-Benz built roughly 1,400 Gullwing coupes and about 3,258 W198s in total once you include the roadster, per Wikipedia’s BMW 507 entry and its 300 SL counterpart. That’s a scarcity ratio of better than 12 to 1 in the 507’s favor even against the Gullwing alone, and closer to 13 to 1 against the full W198 production run. Every surviving 507 is, almost by definition, a documented, traceable car; the population is small enough that specialist clubs and marque historians can account for the overwhelming majority of surviving examples.

The 300 SL’s larger population cuts two ways for a collector. It means better parts support, a deeper base of specialist mechanics who’ve worked on the model for decades, and more comparable sales to anchor a valuation. It also means a 300 SL, while genuinely rare by any ordinary car standard, will never carry the same “there are only 252 of these on Earth” narrative that drives bidding wars for the 507. Scarcity without a story is just a small number. Scarcity with a story, brand mythology, celebrity ownership, and a company-nearly-failed backstory, is a different asset class entirely.

The Valuation Paradox: Why the “Flop” Now Outsells the “Success”

Here is the finding that should reorient how any collector thinks about classic cars as an asset class: the BMW 507, a car that lost money on every unit BMW sold, now routinely commands prices at or above the Mercedes-Benz 300 SL, the car that funded its own production run and built Mercedes-Benz’s postwar performance reputation, per MercedesBlog’s analysis, “Why the BMW 507 Is More Expensive Than the Mercedes 300 SL Even Though It Was a Flop.”

The mechanism isn’t mysterious once you separate two things collectors often conflate: commercial success and collectible scarcity. The 300 SL’s much larger production run made it a genuine commercial success in 1955, and that same production run makes it comparatively more attainable and more liquid today. There are simply more Gullwings changing hands in any given year, which keeps the market deep but also keeps a ceiling on how scarce any single example can claim to be. The 507’s commercial failure produced the opposite outcome: a population so small, and so thoroughly documented, that each surviving car functions almost like a unique collectible rather than a member of a large production class, as MercedesBlog notes.

One figure worth flagging with appropriate caution: some non-English sources place current 507 valuations in the neighborhood of €900,000 (roughly $950,000-$980,000 at prevailing exchange rates), according to the Ukrainian Wikipedia entry on the BMW 507, though that number should be treated as directional rather than a benchmark. Against a period base price that BMW itself lost money on, that figure represents a valuation multiple in the triple digits, a trajectory the 300 SL’s larger, more liquid production run has never needed to replicate to remain a blue-chip collector asset in its own right. Auction results for a car this rare vary enormously by condition, provenance, and originality, so anyone evaluating a specific 507 for sale or as loan collateral needs a current, asset-specific appraisal rather than a headline figure from any single source.

Provenance, Celebrity, and the Collector Premium

Provenance is the multiplier that turns rarity into a price premium, and few cars illustrate that better than the 507. Elvis Presley bought one while stationed in Germany with the U.S. Army; Alain Delon and Ursula Andress, both defining faces of European cinema in the era, owned examples too, per Car & Classic’s buyer’s guide. A 507 with a documented celebrity chain of ownership isn’t competing against other 507s on engineering merit alone. It’s competing on a story that a spec sheet can’t replicate, and stories don’t depreciate the way mechanical components do.

The 300 SL carries its own mythology, largely built around motorsport rather than Hollywood: its direct descent from the W194 race car and its status as the first series-production car with mechanical fuel injection give it an engineering-first narrative that appeals to a different kind of buyer, per Wikipedia. Both narratives hold value. The distinction for a collector or lender evaluating either car is recognizing which kind of provenance actually moves a specific example’s price at auction, and confirming that provenance with documentation, not folklore, before treating it as a value driver.

What This Means for Collectors and Asset-Backed Lending

For an HNW collector or a family office weighing classic cars against other alternative assets, the 507/300 SL comparison is a useful corrective to a common assumption: that a car’s period sales success is a proxy for its long-term value stability. It isn’t. Scarcity, documentation, and narrative are the more durable inputs, and they can produce a valuation trajectory that runs in the opposite direction of the original business outcome.

That distinction matters just as much when a car is being considered as collateral rather than a straight sale. A lender evaluating either the 507 or the 300 SL for an asset-backed loan isn’t simply asking “how many were built.” The evaluation weighs documented rarity, condition, ownership history, and market liquidity together, because those factors determine how stable the asset’s value is likely to be over the life of a loan, not just where it sits today. A car with a small, well-documented production population and a compelling ownership record can support a valuation that holds up more consistently than a more common car with a thinner paper trail, even if the common car has a deeper trading market on any given day.

If you’re weighing a 507, a Gullwing, or another documented collector car against your own liquidity needs, that valuation work is exactly where a specialty lender earns its keep.