Is driving around with your gas filler door open the automotive equivalent of an inadvertently opened fly? If it is, then this Mercedes-AMG C53 prototype’s groundhog is in danger of seeing its shadow. CarBuzz spy photographers have just snapped the barely covered fast sedan testing in Southern California. It’s the car that will solve the problem of the unloved four-pot C63.
But it won’t completely solve that problem. This is, after all, a step down from the flagship C-Class super sedan. But if your preferred method of measurement is cylinder count versus outright power, then this camouflaged car is definitely a step up.
Mild Camo Is Hiding A Six-Cylinder Future
Mercedes-AMG C53 spy photoCarBuzz/Valnet
This prototype is hiding more than just a new engine. It’s also the facelifted version of the current C, and that will bring the latest Mercedes-Benz star-logo headlights to the car. It will also have a revised front bumper with new air inlets, and it looks like Mercedes-AMG is dropping the fender vent accents from the C63.
At the back, the C53 will have four round tailpipes instead of the more square pipes on the back of the four-cylinder PHEV C63. There are new taillights, once again getting the star logo effect, and the car will get a new rear spoiler. The camouflage hints at other minor changes to the trunk lid trim as well. The open filler flap is related to a sensor that’s probably measuring evaporative emissions or monitoring the fuel tank.
We can’t see any obvious signs of changes to the cabin from these angles. We don’t expect any major changes, with the differences limited to new hardware and software for the MBUX system.
It’s under the hood where the main differences lie. The C63’s M139 2.0-liter four makes 469 horsepower, with a 201-hp electric motor boosting total output to 671 hp. That’s more than the previous-generation 4.0-liter twin-turbo V8 made, with the four nearly matching the eight on its own. But it was not what buyers wanted, and AMG has admitted that.
A Cylinder Win, But At Great Cost
Mercedes-AMG C53 spy photoCarBuzz/Valnet
So it will be replaced by the M256 3.0-liter turbocharged inline-six, as found in the CLE53. As the name suggests, it makes less power than the 63, with the engine turning out 443 hp plus another 23 hp from the 48V starter-generator. It’s a Pyrrhic victory if we’re being generous, but AMG feels this time it’s more in line with what customers want. The car will be an estimated 800 pounds lighter, which might make up for some of the power loss, but certainly not all of it.
We still hold some hope for the CLE’s upcoming V8 finding its way here, but don’t hold your breath. At least not until the next-generation C-Class arrives in a few more years.
If you want more than 500 hp in a C-Class in 2027, you’ll probably need to look to the electric. It’s not official yet, but the AMG C-Class EV has been spotted testing and is expected to get three motors and around 600 horsepower when it goes on sale.
CarBuzz Insight – Why This Matters:
Mercedes-AMG C53 spy photoCarBuzz/Valnet
Mercedes-AMG and Stellantis have both learned the same lesson: buyers of performance cars don’t want smaller engines or electrification, even if it delivers more power. Ram truck and C-Class buyers are both fine with using more fuel to make less power, as long as the engine sounds better. The question is, will the six-pot AMG satiate enough of those V8-wanting buyers? It could be a hit, but it could be a bloodbath.
