GM was recently caught benchmarking the Mercedes-Benz S580 sedan around the GM Milford Proving Grounds in Michigan.
The Mercedes-Benz S580 is the German automaker’s large premium four-door model, slotting in below the even-more-high-end Mercedes-Maybach S-Class. As one would expect, the S-Class is rather large in terms of exterior dimensions, with an overall length of 208.2 inches, a wheelbase of 126.6 inches, an overall width of 83 inches, and an overall height of 59.2 inches. Passenger capacity is capped at five.
Providing the motivation is Mercedes-Benz’s twin-turbocharged 4.0L V8, which is supplemented by a 48-volt “mild hybrid” system. Peak output is rated at 496 horsepower at 5,500 rpm and 516 pound-feet of torque, all of which is routed to the full-time all-wheel drive system via a nine-speed automatic transmission. Despite weighing a healthy 4,775 pounds, the Mercedes-Benz S580 can sprint from 0 to 60 mph in 4.4 seconds.
Pricing for the Mercedes-Benz S580 starts at $117,700. Alternatively, Merc also offers the six-cylinder S500 model, which starts at $111,100.
Critically, GM currently has no direct rival for the Mercedes-Benz S-Class, with the Cadillac CT6 being the closest match with regard to size. That said, the CT6 does not match up to the Mercedes-Benz S-Class in terms of positioning, as although the CT6 was roughly equivalent in terms of sizing, it more closely rivaled the Mercedes-Benz E-Class in terms of pricing.
The Cadillac CT6 was offered in the North American market between the 2016 and 2020 model years. The CT6 is still currently sold in the Chinese market.
Looking ahead, it’s likely the next-generation Cadillac CT6 will continue the formula established with the first-gen model, including S-Class sizing and E-Class pricing. In fact, GM Authority recently provided early spy photos of the next-gen CT6 testing in prototype form. However, we should reiterate that the next-gen CT6 will continue to be sold exclusively in the Chinese market.