2026 Mercedes AMG C63 May Swap Four-Cylinder for I6

Mercedes-AMG is preparing something different for the next C63. The current model uses a turbocharged four-cylinder hybrid system, but buyers have not been excited about it. Reports now say Mercedes may bring back the powerful V8 engine.

This move could answer concerns from fans who missed the old sound and feel of AMG cars. The new C63 will mix old power with the latest technology in the United States.

This blog explores how the 2026 Mercedes AMG C63 may shift from a four-cylinder hybrid to a six-cylinder setup and what it means for buyers.

2026 Mercedes AMG C63: From Four To Eight Cylinders Again

The current C63 uses a 2.0-liter turbocharged four-cylinder engine paired with a plug-in hybrid system. Together, they make 671 horsepower and 752 lb-ft of torque. Even though these numbers are high, many fans and buyers were not impressed.

The sound and feel of a four-cylinder did not match the AMG experience (such as with the Mercedes AMG GT Coupe model). Mercedes seems to be listening to this feedback with plans to switch back to a V8 engine.

Under The Hood: The Return Of The V8 Engine In A New Form

Reports say the new AMG C63 will get a 4.0-liter twin-turbo V8 engine. This time, it could have a flat-plane crankshaft instead of the older cross-plane design. That will give the engine a sharper and sportier sound.

A 48V mild-hybrid system might also support the V8. This way, Mercedes can offer strong performance while still meeting emissions rules. The brand aims to mix tradition with cleaner technology.

Performance: Stronger Engine, Lighter Weight, Better Balance

One big complaint about the current model is its weight. The plug-in hybrid system made the car weigh over 4,800 pounds. With the new V8 setup, Mercedes might drop the plug-in hybrid part, making the car lighter.

That could improve how it handles and feels on the road. The C53, a possible new version, might use a 3.0-liter inline-six engine with mild-hybrid tech. That would also help reduce weight and keep performance strong.

Platform Changes: Making Room For A Bigger Engine

Putting a V8 back into the C-Class is not simple. The current platform was not made for that size of engine. Reports say Mercedes (including the Mercedes Benz E Class model) has already made some changes to fit the V8 in.

These include updates to the body and safety systems. There may also be new crash testing needed to meet safety laws. The fact that tuners have fitted V8s into the car shows it is possible, just not easy.

Technology: Smart Hybrid Support Without Plug-In Charging

While the last C63 used a plug-in hybrid system, the 2026 version may switch to a mild hybrid setup. It means the battery helps the engine but does not need to be charged by plugging in. This change could make the car simpler, lighter, and easier to maintain.

Mercedes believes a mild-hybrid V8 could bring back the excitement while staying efficient enough for today’s rules. It is a smart way to mix old and new.

Market Strategy: What Buyers Can Expect?

There are also rumors that Mercedes will stop selling both the current C43 and 2026 Mercedes AMG C63. A new C53 might replace these models. The C53 could use the 3.0-liter inline-six engine found in the CLE53, which makes 443 horsepower.

That would still offer strong performance. The C63, with its V8, would sit above it. It helps Mercedes give customers options while keeping AMG models more exciting and easier to tell apart.

Brand Message: Listening To Buyers Who Miss The V8

Mercedes-AMG executives once said buyers would get used to smaller engines, just like they got used to smartphones. But that has not worked out well. Sales of the current C63 have dropped, and many customers miss the V8.

Mercedes is changing direction to give buyers what they want. Returning to a V8, even with mild-hybrid help, may rebuild the strong AMG (Read more about Unveiled Mercedes-AMG Super SUV With 1,000 Horsepower here) image and bring back more interest in the C-Class.

Conclusion

The next Mercedes-AMG C63 looks ready to balance strong power with modern design. Reports suggest a return to a V8 engine, likely with smart hybrid support. At the same time, rumors about a lighter and simpler C53 show how Mercedes wants to offer choice to buyers.

The 2026 Mercedes AMG C63 marks a turning point for performance enthusiasts seeking more power and refinement in a future-ready package. Stay tuned for more updates as Mercedes reshapes its AMG lineup.