Mercedes-AMG C43 vs. BMW M340i
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Mercedes C43 vs. BMW M340i: 6 Differences & Which Is Best?

Today, we’re diving into a face-off between the Mercedes-AMG C43 and the BMW M340i.

Now, if these names sound like a mix of letters and numbers, don’t worry!

The main difference between the Mercedes-AMG C43 and the BMW M340i is that the C43 has a 2.0-liter four-cylinder engine, while the M340i has a 3.0-liter six-cylinder engine.

By the end of this article, you’ll have a clearer picture of which car might be best for you.

Ready? Let’s start!

6 Differences Between The Mercedes C43 AMG And BMW M340i

Let’s check out all the differences between this Mercedes C-Class and BMW 3 Series!

1. Engine

Okay, let’s start under the hood.

First up is the Mercedes C43 AMG. It has a 2.0-liter four-cylinder engine with mild-hybrid technology, which, in simple terms, means it’s a little friendlier to the environment. This engine pumps out an impressive 402 horsepower.

BMW M340i 3.0-liter six-cylinder B58 engine
BMW M340i engine

Now, onto the BMW M340i, which has a 3.0-liter straight-six engine.

This engine has been praised by many car enthusiasts. It’s smooth, balanced, and has this distinctive sound.

The M340i’s engine, codenamed B58, also comes with that mild-hybrid tech, producing a slightly lower but still robust 382 horsepower.

Fun fact: this B58 engine has earned quite the reputation for being highly reliable, which is a huge plus.

Mercedes-AMG C43 2.0-liter four-cylinder engine
Mercedes-AMG C43 engine

Here is an overview of the engines of the Mercedes C43 AMG and BMW M340i and their performance:

ModelEnginePower (hp)Torque (lb-ft)0 to 62 mph
C43 AMG2.0-liter four-cylinder4023694.6 seconds
M340i3.0-liter six-cylinder3823693.7 seconds

As you can see in the video below, although the C43 AMG has more power, the M340i will win in a drag race:

Verdict: On paper, the Mercedes seems to have a slight edge with its higher horsepower. But while the C43 AMG might have the numbers, the sound it produces… well, it’s not everyone’s cup of tea. It sounds more artificial, as it’s also amplified through the speakers.

On the other hand, the M340i has that natural, authentic rev of a six-cylinder engine that resonates with many car lovers. Plus, it simply performs better!

Therefore, the M340i wins in the engine category.

Related article: How Long Does A BMW 3 Series Last? (Based On Real Data)

2. Weight

Let’s talk about weight.

Now, you might be thinking, “Why does weight matter in a luxury car?”

Well, weight plays a crucial role in how a car handles, accelerates, and even how much fuel it consumes.

Think of it like this: running with a backpack is harder than without, right?

So, diving into numbers:

The Mercedes C43 AMG tips the scales at 4,092 lbs. That’s roughly the weight of two small cars or, for a fun visualization, about 20 adult pandas. (Yep, pandas!)

The BMW M340i is a bit leaner, weighing in at 3,968 lbs. It might not sound like a massive difference from the C43 AMG, but it can be noticeable.

Verdict: In this category, the BMW M340i wins. Being lighter gives it an advantage in agility, potentially quicker acceleration, and, in some cases, better fuel efficiency.

3. Styling

Car design is the first thing most of us notice, right?

Starting with the Mercedes C43 AMG.

Its exterior has a certain poshness to it. Think of it as the well-tailored suit of the automotive world.

Mercedes-AMG C43 AMG exterior front

Crisp lines, a distinctive grille, and a poised stance make it look like it’s ready for a red carpet-event.

Inside, it’s a whole other level of fancy.

Mercedes-AMG C43 AMG interior

The C43 AMG offers an interior that’s like stepping into the future. There’s a generous use of ambient lighting that you can customize (fancy a soft blue hue or a passionate red?), giving the cockpit a sci-fi aura.

Side note: While the AMG has its share of bells and whistles, many drivers find that BMW’s infotainment system is much better.

Speaking of the BMW M340i, externally, it shows more sportiness. Sharp angles, a muscular build, and a design that seems to be always in motion even when it’s standing still.

BMW M340i exterior front

Inside, BMW has chosen a more timeless approach. It’s less “space-age” and more classic luxury.

BMW M340i interior

Plush seats, intuitive controls, and a design that feels both modern and timeless.

And yes, BMW’s iDrive infotainment system, which many argue is much better than Mercedes’ system, sits proudly on the dashboard.

Verdict: This one’s a bit of a toss-up because styling is deeply personal. If you’re someone who’s all about that futuristic vibe, the C43 AMG is calling your name. However, if your taste leans towards a blend of sportiness with classic charm, the M340i might be your perfect match.

Fun fact: Did you know that the Mercedes C-Class can last over 280,000 miles?

4. Driving

Now, let’s get to the heart of the matter: the driving experience.

Kicking off with the Mercedes C43 AMG.

Mercedes-AMG C43 AMG while driving

When you’re nestled in its driver’s seat, there’s a comfort that’s instantly noticeable. The suspension is tuned in a way that your coffee remains spill-free.

Its steering is precise, but there’s a softness to it. It’s like being in a plush lounge chair that can go really, really fast.

Now, the BMW M340i.

The moment you start driving, there’s a connection between you, the car, and the asphalt. The handling is tight and responsive. You feel every curve, every turn – not in a jarring way, but in a manner that communicates the road’s texture.

BMW M340i while driving

And that gearbox? It’s like butter. Smooth transitions between gears make accelerating feel effortless.

Verdict: If your ideal drive is akin to a relaxing day at the spa, the C43 AMG is your go-to. But if you’re the type who loves feeling in sync with the road, then the M340i stands out.

5. All-wheel drive vs. rear-wheel drive

The Mercedes C43 AMG always comes equipped with an All-Wheel Drive (AWD) system, known in Mercedes lingo as “4MATIC”. In layman’s terms?

Mercedes-AMG C43 AMG exterior rear

Power is distributed to all four wheels, providing more grip, especially in tricky conditions like rain or snow.

On the other hand, the BMW M340i offers a choice. It’s available in both a Rear-Wheel Drive (RWD) variant and an AWD version called “xDrive.”

BMW M340i exterior rear closeup

The RWD, as the name suggests, sends all the power to the rear wheels.

This can give a lively feel to the car, making it more playful and, in some conditions, a tad sportier. Drifting fans, you know what I’m talking about!

But if you want that extra grip and balance, especially for wet or wintry commutes, the xDrive variant is there as well.

Verdict: While the C43 AMG’s 4MATIC is undoubtedly reliable and great for all-round performance, the M340i’s versatility in this category gives it the edge.

6. Price tag

Ah, the all-important question: What’s it going to cost me?

Both the Mercedes C43 AMG and the BMW M340i have starting prices around the $60k mark.

Given all the aspects we’ve covered so far – engine performance, weight, styling, driving experience, and drivetrain options – it becomes a matter of what matters most to you.

Verdict: At face value, the price tag is a tie. However, when you factor in the overall offerings, some might argue that the BMW M340i delivers more bang for your buck. Especially when considering its six-cylinder engine and stellar driving experience.

Tip: Take a look at this article if you’re interested in buying a Mercedes C-Class: Mercedes-Benz C-Class Reliability: Which Years To Avoid?

What is the best choice? (Mercedes C43 AMG vs. BMW M340i)

So, which one should you park in your garage? Let’s break it down.

The Mercedes C43 AMG has a futuristic design, a lot of ambient lighting, and a plush drive that wraps you in a bubble of comfort. It’s the choice for those who want a touch of opulence, a hint of the future, and a relaxed cruise down any road.

The BMW M340i, on the other hand, speaks to the purists. With its authentic six-cylinder engine, responsive driving dynamics, and a choice of drivetrains, it caters to those who love the thrill of the drive. It’s a car that asks to be driven, not just to be seen in.

By now, you’ve probably picked up a theme: Do you prefer luxury and sophistication, or do you lean towards performance and driving pleasure?

In the end, it’s all about what makes your heart race a little faster, and luckily, both these cars are experts in that!

Related article: BMW 3 Series Depreciation: How To Avoid Losing Big In 2024


Remember, a car isn’t just about horsepower, features, or even the price tag. It’s about the feeling you get when you’re behind the wheel, the pride of ownership, and how it fits into your daily life.

But here’s the great news: whether you lean towards the C43 AMG or the M340i, you’re in for an exceptional driving experience.

Which one is your favorite? Let us know in the comments below!

Safe travels, and enjoy every mile!

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