In the mid-2000s, the toughest heavy-duty diesel-powered pickup trucks on the market, the kind rated for towing entire horse trailers, couldn't touch 700 lb-ft of torque. But this V12 engine from Mercedes-AMG delivered 738 lb-ft of it at just 2,000 rpm, with a gentle nudge of the go-fast pedal.The car that carried it looked like nothing special. Large, dark, unhurried in traffic. The kind of vehicle people glance at and move on, a true sleeper. What they didn't know was that the engine under that hood was physically capable of producing 885 lb-ft. Mercedes had to electronically tame it down, not for performance reasons, but because anymore would shred the gearbox. When AMG Decided One Person Should Build the Whole Engine Mercedes-AMG In the early 2000s, the AMG division's identity ran on a single principle: "one-man, one-engine", at the AMG facility in Affalterbach, Germany. When the engine was done, the technician signed it. A small metal plate, engraved with their name, went into the engine bay. Every owner of an AMG vehicle from this era is, in a real sense, driving something one specific human being made. A philosophy still used today.A single M275 V12 took roughly seven hours to build by hand. To prove the point, AMG sent a technician to the Chicago Auto Show floor to assemble one in public, the only time the engine was ever built outside of Affalterbach. AMG believed that if one person built it, one person was accountable for it, and that accountability showed up in the finished product. At the very top of that philosophy sat a twin-turbocharged twelve-cylinder engine capable of torque figures that would give its own drivetrain mechanical diarrhea. The Mercedes CL65 AMG And The Gearbox Shredding V12 Bring a TrailerThe Mercedes-Benz CL65 AMG arrived in 2003 as the performance flagship of the C215 generation, and ran through 2006. A second generation, the C216, followed in 2007 and continued through 2013. Two generations, one engine philosophy, and one number that defined both: 738 lb-ft (magical feat of 1,000 Nm).Bring a Trailer At the center of the C215 was the M275. A 6.0-liter twin-turbocharged V12, hand-assembled in Affalterbach, producing 604 horsepower and 738 lb-ft of torque. That torque output was electronically limited to a ceiling imposed to keep the drivetrain in one piece. The engine held its peak torque flat and constant between 2,000 and 4,000 rpm, while its true physical potential was 1,200 Nm, roughly 885 lb-ft. AMG was forced to limit the torque output because the transmission couldn't handle more.Bore measured 82.6 mm, stroke 93 mm, total displacement 5,980 cc. Boost pressure reached 22.1 psi at maximum. The engine ran air-to-liquid intercoolers and two spark plugs per cylinder. Peak power arrived between 4,800 and 5,100 rpm.Bring a TrailerThe CL65 AMG covered 0–60 mph in 3.8 seconds, but top speed was electronically limited to 155 mph. This was a car weighing well over two tonnes.The transmission paired to all of this was AMG's Speedshift five-speed automatic, internally reinforced specifically to handle the torque load the M275 was putting through it. The 2007 C216 refresh brought revised exterior styling and updated suspension calibration, with later examples in certain markets producing 630 hp. Why The SL65 And S65 Always Got The Credit Over The CL65 Mecum The CL65 AMG was overlooked because it was the least obvious AMG built Mercedes with the M275 V12. The SL65 AMG had the roadster halo. It photographed like a dream and showed up at concours events looking exactly like it belonged there. The widebody Black Series is still one of the greatest looking cars of its era.The S65 AMG carried the S-Class nameplate that carries as much weight as the CL65 does on the curb. The S-Class is the car Mercedes uses to define what a flagship sedan means; heads of state, executive transport, institutional weight. The CL65 didn't inherit any of that gravity. It sat between two identities: not the sports car, not the limousine. A grand tourer that was genuinely stunning in person but easy to walk past in a brochure.Bring a Trailer Timing worked against it too. The CL65 AMG arrived just as turbocharged engines were beginning to replace naturally aspirated ones as the performance benchmark. It had neither the analog purity collectors loved in older flagships, nor the freshness of what AMG would build next.Only 777 examples of the C215 were produced before the generation ended in 2006. The SL65 Black Series, the Pagani Huayra's use of the M275 engine, and years of S65 AMG coverage absorbed the attention the CL65 never quite received. How It Stacked Up Against Bentley And Aston Martin Mecum When the CL65 AMG launched in 2003, the competition was serious. The Bentley Continental GT W12 arrived with 552 hp, all-wheel drive, and the full weight of Crewe craftsmanship behind it. The Aston Martin DB9 brought a naturally aspirated V12 and one of the most beautiful bodies in the business. Both were critically acclaimed. Both are more celebrated today in collector circles than the Mercedes that outran them.On series 4, episode 11, Top Gear put all three in a drag race, the CL65 AMG, the Continental GT, and the DB9. The Mercedes left both of them behind. However, the high torque output meant that it set a 1 min, 29 sec lap time, slower than the 1:27.1 time set by the DB9 three episodes earlier.Aston Martin That result wasn't a surprise to anyone who understood the torque numbers. The CL65 AMG was putting 738 lb-ft to the rear wheels from 2,000 rpm. The Bentley and the Aston simply had no answer to that kind of thrust at that point in the rev range in a drag race.The Bentley became the grand tourer collectors reach for first. The Aston became the emotional icon. The CL65 AMG, the one that won the drag race, quietly depreciated into the background. What A CL65 AMG Actually Costs In 2026 Bring a Trailer A fully optioned 2005 CL65 AMG left the showroom at around $182,280. That was the asking price for a hand-built, twin-turbocharged V12 grand tourer at the peak of AMG's most ambitious era. Today, the market tells a very different story, and it's splitting in two directions at once.Bring a Trailer On the accessible end, the lowest recorded sale on Classic.com was $19,750 for a 2005 example. On the other end, a CL65 that was purchased for $183,360, with 2,853 miles example sold changed hands for $60,500 earlier in 2025. But a year later, the same car with 3,300 miles climbed to a staggering $303,303 on Bring a Trailer in early 2026. That is simply ridiculous.The average sits around $61,702, primarily because of the low-mileage sale. But excluding that particular anomaly, the realistic average value sits around $38,500, based on 11 sales over the last 12 months. That's a lot of car for the money if you know what you're buying and what it needs.Bring a Trailer The practical buying window is still wide. Good-condition, higher-mileage C215 and C216 examples are regularly available between $12,000 and $40,000. A car that cost more than many American homes in 2005 is still within reach for the right buyer.For context, the SL65 AMG, the roadster that stole the CL65's spotlight, averages $49,642 on the current market. The S65 AMG sedan sits at $28,085. The CL65 AMG, at $38,500, sits right between the two cars that overshadowed it, for a fraction of what all three cost new. The Real Cost Of Running A Twin-Turbo V12 AMG Bring a Trailer The CL65 AMG rewards prepared buyers and punishes unprepared ones. That's true of most complex German performance cars from this era, and the CL65 is no exception.The primary ownership challenges are well documented. ABC, Active Body Control, Mercedes' hydraulic suspension system, is the component that gets the most attention in owner forums. Electrical issues and the cost of specialist parts round out the list of things to budget for before you write the check.Bring a Trailer The most commonly reported mechanical issue is ignition coil pack or ignition module failure. It shows up as rough running or a loss of power, and it's not cheap to sort if it's been neglected.Experienced owners are consistent on one point: the M275 engine and the transmission are fundamentally solid. It's the ABC suspension system where money gets spent. The recommendation from forum veterans is to factor in an additional $5,000 to $10,000 over the purchase price to sort an unsorted car properly.Bring a Trailer The ownership profile that works is straightforward: buy from documented history, find a Mercedes-specialist independent shop you trust, and go in with eyes open.Do all of that, and what you get in return is 738 lb-ft at 2,000 rpm, delivered in near silence, in a car that draws almost no attention from the outside world. That experience, at this price point, doesn't exist anywhere else on the used market right now.
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