40

Listed Now

$20,090

Avg. Asking Price

1972–1980

Year Range

Transmission Distribution

Automatic 78% ◄

Manual 3%

Condition Distribution

Excellent 25% ◄

Good 23%

Fair 3%

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R107 rust follows predictable patterns. The jacking points (under the rocker panels at front and rear), the rear quarter panels (lower section behind the rear wheels), the trunk floor, the front fender behind the front wheels, the windshield surround at the cowl, and the rear wheel arches are all standard rust zones. The unibody construction means rust here isn't merely cosmetic, proper repair requires careful welding and is expensive. Mechanically, the M117 4.5L V8 is among the most over-engineered V8s Mercedes ever produced. Cast iron block, aluminum heads, mechanical Bosch K-Jetronic fuel injection, and timing chain (not belt) for primary drive. The engine commonly exceeds 250,000 miles when properly serviced. Common issues include timing chain stretch (replace at 100,000-150,000 mile intervals), valve stem seal leaks (causing morning oil-burn smoke), and Bosch K-Jet fuel distributor failures ($2,500-$4,500 to replace properly). The 3-speed automatic (1973-1976) and 4-speed automatic (1977-1980) are both robust but require regular fluid changes. The rear suspension subframe bushings collapse over time and cause clunking on launch, a $1,500-$3,000 repair. Vacuum systems control everything from door locks to climate to throttle linkage, and 50-year-old vacuum lines crack everywhere, budget $800-$2,000 for complete vacuum line replacement on any neglected car.

The Mercedes-Benz Classic Center (in Long Beach, California) maintains original production records and can issue a Data Card ($80-$150) confirming the original specification of any 450 SL: chassis number, engine number, paint code, interior code, options, and delivery destination. For any 450 SL priced over $30,000, the Data Card is recommended documentation. Rust inspection is the first non-negotiable. Lift the car on a hoist or use jack stands and inspect the jacking points (the four steel reinforced points where the factory jack attaches). Inspect the rear quarter panels with strong light and a magnet, body filler over rust is universal on driver-quality cars. Lift the trunk mat and inspect the trunk floor and the spare tire well. Inspect the windshield surround at the cowl from inside the cabin, rust here causes water leaks that rot the dashboard. Engine and transmission verification: the M117 V8 engine number is stamped on a flat pad on the driver-side of the block (passenger side on RHD cars). The transmission number is on a tag attached to the case. Cross-reference both against the Data Card. Hardtop condition is unique to R107 ownership. The 450 SL came standard with both a soft top (cloth convertible top) and a removable hardtop (steel structure with rear glass). The hardtop is critical to winter weather use and adds 10-15% value when present and original. Verify the hardtop fits properly, the rear glass is original (Sigla glass with date code), and the headliner inside the hardtop is intact. Electrical audit: test every gauge, every switch, every climate function. The R107 climate control system is notoriously complex, vacuum-actuated heater valves, electrically-actuated mode doors, and a two-zone temperature regulation that fails expensively. Budget $1,500-$3,500 for proper climate system service on any car older than 40 years.

1973-1976 450 SL cars (early R107) are the most desirable era. Driver-quality 1973-1975 cars run $22,000-$38,000. 1973 was the federalized launch year and US-market cars from this period have unique 5-mph bumpers in less-attractive forms. 1975-1976 cars with refined interior trim are the sweet spot at $25,000-$42,000 for solid drivers. 1977-1980 450 SL cars saw the introduction of the more sophisticated 4-speed automatic (1977+) and updated emissions equipment that slightly reduced output. Driver-quality cars from this era run $20,000-$35,000. The 1980 model year is the final year of the 450 SL designation in US markets, the 1981 cars switched to the 380 SL (3.8L V8) due to federal fuel-economy regulations. Documented original-paint, low-mileage, two-owner cars are now bringing significant premium pricing. Concours-grade restored 1973-1975 450 SLs trade for $45,000-$75,000. Documented sub-30,000-mile original cars in time-warp condition: $55,000-$95,000. Project cars (running but rough) start around $8,000-$15,000. Stripped roller candidates can be had for $3,500-$8,000, but rust restoration on an R107 typically runs $15,000-$35,000 in body and structural repair alone before paint. Buy finished cars from competent specialists.

The R107 SL platform launched in 1971 and ran continuously through 1989, eighteen production years and over 237,000 units across all variants (350 SL, 380 SL, 420 SL, 450 SL, 500 SL, 560 SL). It is the single longest production run of any Mercedes-Benz body style ever produced. The 1973 launch year of the 450 SL in the US market was specifically designed to comply with the new 5-mph bumper regulations (FMVSS 215) that took effect for 1973 model year vehicles. Mercedes-Benz designed unique reinforced bumpers for US-market R107 cars that distinguish them visually from European-market "Euro-spec" cars (which retained the slimmer original bumpers throughout the production run). The M117 V8 engine that powered the 450 SL was developed as Mercedes-Benz's first all-new V8 since the 1968 introduction of the M116 (3.5L V8). The M117 architecture (4.5L initially, growing to 5.6L in late R107 cars) remained in production through 1991, powering everything from the 450 SEL 6.9 super-sedan to the 560 SEC coupe and eventually the 500 E sport sedan developed jointly with Porsche.