Mercedes-AMG is preparing a significant shake-up for its SL roadster lineup, and in an unusual twist, stricter emissions rules are prompting the brand to increase engine size rather than shrink it. According to fresh reports from Germany, the current Mercedes-AMG SL 43 will be replaced by a new SL 53 as part of the model’s upcoming 2027 refresh.
While tightening emissions standards usually push automakers toward smaller engines, Euro 7 regulations are forcing AMG to rethink its strategy. The existing SL 43 uses a highly tuned 2.0-liter four-cylinder engine, but the unit is reportedly struggling to meet future emissions requirements. Instead of downsizing further, AMG is moving to a 3.0-liter turbocharged inline-six paired with mild-hybrid technology.
It’s a move that signals AMG’s effort to balance performance, refinement, and compliance without compromising the character expected from the SL.
Six Cylinders, More Power, Cleaner Output
The new entry-level SL 53 is expected to use the familiar 3.0-liter turbocharged inline-six found across the AMG 53 lineup. This engine will be paired with a mild-hybrid system, including a starter-generator that contributes an additional 23 horsepower.
Combined output is expected to reach 449 horsepower, a notable jump over the current SL 43. Beyond outright power, the six-cylinder setup should also deliver smoother performance, improved efficiency, and better emissions control.
This shift also aligns the SL with other AMG 53 models, bringing consistency across the performance lineup. More importantly, it restores some of the refinement enthusiasts expect from a luxury grand touring roadster.
All-Wheel Drive Coming to Entry-Level SL
Another major upgrade expected with the SL 53 is standard all-wheel drive. Currently, AMG reserves its 4Matic system for the V8-powered SL 55 and SL 63 variants. Introducing AWD to the entry-level model will enhance traction, stability, and year-round usability.
This change also reflects AMG’s broader move toward more accessible performance, giving buyers stronger capability without stepping up to the more expensive V8 models.
V8 Models Getting Performance Boost
The updates won’t stop with the six-cylinder model. Reports suggest that AMG is also revising its twin-turbo 4.0-liter V8 engines for the SL 55 and SL 63.
The biggest change is expected to be the switch from a cross-plane crankshaft to a flat-plane crankshaft. This modification typically allows engines to rev higher, improve throttle response, and deliver a sharper exhaust note.
Power figures are expected to climb accordingly:
- SL 55: Around 537 horsepower
- SL 63: Around 650 horsepower
These increases would represent meaningful performance gains while helping AMG maintain competitiveness in the high-performance luxury roadster segment.
Plug-In Hybrid Future Still Unclear
Interestingly, the report does not mention the SL 63 S E Performance plug-in hybrid currently available in select markets. It remains unclear whether AMG plans to update or replace this electrified performance model as part of the 2027 refresh.
Given AMG’s growing electrification strategy, updates to hybrid models are still likely, but details remain under wraps for now.
2027 Refresh Timeline
The revamped Mercedes-AMG SL lineup is expected to debut as part of a 2027 model refresh, meaning official details should emerge within the coming months. Until then, AMG’s decision to move from four cylinders to six signals an intriguing shift in how performance brands adapt to increasingly strict emissions standards.
Rather than downsizing, AMG is proving that sometimes bigger engines can still be cleaner, smarter, and more exciting.
