2027 Mercedes C 350 Adds 27-HP Overboost, U.S. Launch Set for 2027
Mercedes-Benz has detailed the U.S.-market 2027 C-Class, a heavily revised version of its compact luxury sedan that pairs a 255-horsepower turbo four-cylinder with 48-volt mild-hybrid assistance and a short-duration overboost function.
The rear-wheel-drive C 350 and all-wheel-drive C 350 4MATIC are scheduled to reach U.S. dealerships later in the first half of 2027. Mercedes has not announced U.S. pricing, fuel-economy estimates or a firm on-sale date.
What changes under the hood
Both versions use an updated 2.0-liter M 254 EVO turbocharged four-cylinder rated at 255 hp and 295 lb-ft of torque. Mercedes says an electric auxiliary compressor powered by the 48-volt system fills in response before the conventional twin-scroll turbocharger builds boost.
The engine can also produce an additional 27 hp for about 20 seconds through a repeatable overboost function. That figure should not be read as a new permanent output rating: Mercedes still lists the engine at 255 hp in its technical table.
A second-generation integrated starter-generator contributes up to 23 hp and 151 lb-ft at low engine speeds. It also supports engine-off coasting, energy recuperation and smoother stop-start operation. This is a mild-hybrid system, not a plug-in hybrid, and Mercedes has not claimed any electric-only driving range.
- Transmission: nine-speed automatic
- Drive: rear-wheel drive or 4MATIC all-wheel drive
- Estimated 0–60 mph: 5.8 seconds for either version
- Electronically limited top speed: 130 mph
- Trunk capacity: 11.6 cubic feet
Suspension, design and cabin updates
Mercedes says it stiffened suspension mounting points and retuned the adjustable damping to reduce body movement without giving up long-distance comfort. The company’s 5.8-second acceleration estimate has not been independently verified, and Chiefs Review has not driven the car.
The exterior changes include an illuminated grille surround and central star, new star-shaped daytime running lights and taillights, reshaped bumpers and new 18- and 19-inch wheel designs. An AMG Line Plus appearance package adds a gloss-black spoiler lip and exhaust trim, red seat belts and sports seats with red contrast stitching; it does not change the engine specification.
Inside, the C-Class keeps a 12.3-inch driver display and an 11.9-inch portrait-oriented center screen. The fourth-generation MBUX system runs on Mercedes’ MB.OS platform and combines separate AI services from ChatGPT, Microsoft Bing and Google Gemini for its conversational assistant. Google-based navigation and over-the-air software updates are also part of the package, though some connected functions require a Mercedes account, data plan or paid Digital Extra.
More sensors, with familiar limits
The 2027 C-Class carries eight cameras, five radar sensors and 12 ultrasonic sensors. Standard systems include lane, distance, braking and acceleration assistance, low-speed reverse collision braking and a 360-degree parking view. Mercedes explicitly describes these as support systems: the driver remains responsible for controlling the car and observing system limits.
The optional next-generation Digital Light system uses micro-LED technology and is claimed to be up to 50 percent more efficient than the previous version. An augmented-reality head-up display is also available.
The important unanswered questions
The update adds meaningful powertrain and software changes, but shoppers still need pricing, EPA fuel economy and a precise U.S. launch date before judging its value. Mercedes also sells a separate battery-electric C-Class globally, so the C 350 announcement should not be confused with that model.
The launch comes as the company balances new products with tougher economics. Chiefs Review recently examined Mercedes’ latest quarterly results and shrinking Cars margin, as well as its separate vehicle-to-grid charging rollout in Germany.
Featured image: 2027 Mercedes-Benz C 350. Official press image supplied by Mercedes-Benz USA for editorial media use; view the original media release.
Source
Mercedes-Benz USA published the U.S. specifications, official photography and launch timing on October 26, 2026. All performance and efficiency claims in this report are manufacturer figures unless otherwise noted.