Core summary
U.S. MY2018 Mercedes-AMG S 63 Cabriolet. Source-based specification and buying analysis.
Approach this as a used luxury convertible first and a power figure second. A documented roof inspection, a workable luggage plan and the condition of the individual car matter more than an impressive original equipment list.
History & generations
The reference is the refreshed MY2018 S 63 Cabriolet. It must not be confused with the later S 63 E Performance sedan.
Body, platform & design
Mercedes lists a two-door, four-passenger body measuring 198.9 inches long and 75.3 inches wide without mirrors.
_rear.jpg)
Engine & drivetrain
Its 4.0-liter biturbo V8 makes 603 hp and 664 lb-ft. An AMG MCT nine-speed transmission and variable 4MATIC+ AWD are specified.
.jpg)
Trim differences
On a used car, compare the original build specification with the installed wheels, seats and exhaust. Replacement parts and aftermarket changes can make an advertisement’s equipment list misleading.
.jpg)
Interior & seating
Published luggage volume is 12.4 cubic feet with the roof up. That qualifier is essential when planning an open-top journey.
Efficiency & range
The U.S. specification sheet lists 15/24/18 mpg city/highway/combined. These historical figures are not a prediction for an individual used vehicle.
Safety & equipment
Have a qualified inspector check roof operation and convertible-specific systems. A smooth roof cycle during one viewing does not establish the condition of seals, drains or concealed components.
Strengths
Its case is strongest for someone who values the whole open-top experience, including passenger comfort and unhurried journeys. Buying only for acceleration leaves too much of the ownership decision unexplained.
Its case is strongest for someone who values the whole open-top experience, including passenger comfort and unhurried journeys. Buying only for acceleration leaves too much of the ownership decision unexplained.
Considerations
Budget for rectifying defects before allocating money to cosmetic upgrades. Ask the inspector to distinguish immediate work from optional improvements so the purchase price and first-year expenditure remain separate.
Recommended use
Plan a roof-down luggage test with both passengers and bags present. If that fails, rethink the trip arrangement before deciding that this can serve as your regular touring car.
FAQ
Are the front and rear tires interchangeable? The reference specification uses 255/40 R20 fronts and 285/35 R20 rears. Replacement decisions need the correct axle-specific specification.
What makes the Mercedes-AMG S 63 Cabriolet different?
Its case is strongest for someone who values the whole open-top experience, including passenger comfort and unhurried journeys. Buying only for acceleration leaves too much of the ownership decision unexplained.
Who should consider it?
Open-top high-performance luxury touring
Sources & updates
Reference scope: U.S. MY2018 Mercedes-AMG S 63 Cabriolet. Research-based guide; no hands-on road test is claimed. Manufacturer specifications are distinguished from Cariary buying interpretation. Text reviewed 14 October 2026. Sources for the revised text:
https://media.mbusa.com/news/2018-mercedes-amg-s-63-cabrio-specifications
Last editorial review: August 23, 2026. Specifications remain market- and model-year-specific.