Mercedes-Benz SL: Why the Switch from 4-Cylinder to 6-Cylinder is a Game-Changer for 2026

150 million KRW (about $112,500 USD) — a four‑cylinder?

Mercedes‑Benz finally decides to swap the engine

New SL overhauled with six‑cylinder lineup

Mercedes‑Benz will replace the entry model’s engine in the upcoming SL facelift.

Mercedes will discontinue the four‑cylinder engine used in the current SL43.

It will be replaced with a new six‑cylinder unit.

Customers and critics have long argued that a four‑cylinder doesn’t suit a luxury roadster.

Industry observers see this move as Mercedes responding to market feedback.

3.0 inline six to be fitted…

Model changes to SL53

The new engine will be a 3.0‑liter inline‑six, the M256 Evo.

It is rated at roughly 449 hp and pairs with a mild‑hybrid system that contributes about 23 hp of auxiliary power.

Also, Mercedes will drop rear‑wheel drive (RWD); all‑wheel drive (AWD) will be standard.

V8 also evolves…output rises to 650 hp

Top‑trim models also get a major performance uplift.

The 4.0‑liter twin‑turbo V8 gains power after Mercedes moves to a flat‑plane crank.

• SL55: about 537 hp

• SL63: about 650 hp

The change should deliver a substantial power increase over the current versions.

Driven by emissions rules

Outcome: ‘performance boost’

The change is driven by Europe’s upcoming Euro 7 emissions standards.

With the existing four‑cylinder unable to meet the rules, Mercedes chose a more powerful six‑cylinder instead.

Industry insiders call it a rare example where regulation lifted performance rather than curbed it,

and they say Mercedes is using the move to restore its brand image.

As a result, the new SL is set to put the ‘downsizing controversy’ behind it and return to a true performance roadster.