Ever wondered what happens when the comfort of an S-Class meets the rugged versatility of an All-Terrain wagon? That’s exactly what Mercedes-Benz has done with the E 400 d All-Terrain. And yes, it now comes with the same powerful inline-six diesel engine you’ll find in the S-Class. Let’s just say—it’s a quiet revolution wrapped in luxury and practicality.
Whether you’re cruising on the Autobahn or navigating gravel in the Alps, this beast blends executive elegance with go-anywhere confidence. Think of it as the lovechild between a Mercedes-AMG E and a GLE SUV, but in wagon form.
Overview Of The E 400 D All-Terrain
The Mercedes-Benz E 400 d All-Terrain is not your average estate. It’s more like an E-Class Estate that decided to hit the gym and then enroll in finishing school. It stands taller, rides smoother (thanks to air suspension), and performs like it’s on a mission.
With portal axles giving it a significant boost in ground clearance, it’s ready to handle rough country paths without breaking a sweat—or breaking your back. And if you’re worried about fuel, don’t be. This car blends fuel economy with brute strength. It’s got that “do-it-all” vibe that even a Subaru Outback would respect, but with far more exclusive premium appeal.
Design And Position In The E-Class Lineup
Stylistically, the E-Class All-Terrain slots perfectly between the family-friendly E-Class Wagon and the showier Cabriolet or Coupe options in the E-Class range. Think practical elegance.
Outside, it boasts protective cladding, subtle off-road accents, and the rugged E400d badge that quietly whispers, “Don’t mess with me.” Inside, it’s all smooth leather, ambient lighting, and a steering wheel that feels like it was crafted just for your hands. What’s clever is how this model keeps its cool. It doesn’t scream “off-road beast,” but one look at its rear wheel arches and you know it’s built for more than just city commutes.
Key Competitors In The Luxury Segment
Let’s be honest. This isn’t a one-horse race. The E 400 d All-Terrain faces serious rivals like the Audi A6 Allroad, Volvo S90 Cross Country, and BMW 5 Series Touring xDrive. They all try to combine utility with luxury—but Mercedes takes it further.
While the Audi A6 Avant excels in tech and the BMW 5 Series brings driving sharpness, the E-Class All-Terrain delivers a more complete experience. It’s like comparing an espresso to a full-course Italian dinner—both good, but one’s far more satisfying.
The Om 656 Inline-Six Diesel Engine
Now here’s the heart of the story. The OM 656. This inline-six diesel engine, previously reserved for flagship sedans like the S-Class, now beats inside the E 400 d. That’s like putting a concert grand piano in your living room—elegant, powerful, and awe-inspiring.
With 330 horsepower and a mountain of torque (700 Nm, to be precise), this engine makes merging, overtaking, and long-distance cruising feel effortless. The best part? It hums quietly and runs clean, thanks to smart tech like EQ Boost and mild hybrid drive.
Origins And Features Of The OM 656 Engine
The OM 656 isn’t just some upgraded powertrain—it’s an engineering love letter to diesel perfection. Originally designed for the S-Class and GLE SUV, this 3.0-liter V6-equivalent inline-six boasts aluminum construction, a low-friction design, and two-stage turbocharging. Mercedes has been doubling down on making diesel not just cleaner but also cooler. With AdBlue injection and particulate filters, emissions stay low while smiles stay high.
Performance Enhancements And Fuel Efficiency
Here’s where it gets juicy. Not only is the OM 656 stronger, but it’s also smarter. Compared to the outgoing E 350d and E 220d, the E 400 d sprints quicker and sips less fuel.
We’re talking around 5.7 to 6.2 liters per 100 km in mixed driving—solid fuel consumption numbers for such a powerful machine. That’s especially impressive when you consider the All-Terrain’s size and weight. And because of its advanced mild hybrid drive setup with EQ Boost, you get better start-stop functionality, smoother acceleration, and that little electric nudge when you need it most.
Comparisons To Previous Engines In The E-Class
The older diesel engines like the E 220d and E 350d were solid, no doubt. But they feel like Nokia flip phones next to this engine. The E 400 d with the OM 656 is a new chapter—refined, responsive, and ready to roar. Where the previous engines lacked that final kick, this one surges forward with confidence. Plus, the vibration and noise levels are so low you’ll wonder if you’re driving an electric car.
Impact On Driving Experience
Take it on the highway, and the E 400 d All-Terrain feels like a luxury sedan. But take it onto a country lane, and it morphs into a light-duty off-roader. That’s the real magic. The air suspension keeps the body level and confident, and the ground clearance automatically adjusts based on terrain and speed. Whether you’re towing, traveling, or tackling trails—it stays composed and fun.
Performance And Handling Improvements
Let’s not sugarcoat it—the car handles like a dream. The steering is precise, the rear seat comfort is top-notch, and the E-Class Sedan roots are clearly visible in its balance and poise. Even under load or in tricky conditions, the E-Class All-Terrain inspires confidence. The 4MATIC all-wheel drive ensures that the torque goes where it’s needed, without drama.
Fuel Economy And Real-World MPG Expectations
In real-world terms, most drivers are seeing 32–36 mpg depending on the journey type. That’s quite close to the official fuel economy rating, and surprisingly efficient for something that can haul luggage, pets, and passengers up a ski slope. Even in urban start-stop conditions, it remains frugal. Credit goes to the EQ Boost and intelligent engine management system.
Infotainment And Connectivity Features
Tech lovers, you’re in for a treat. The E 400 d All-Terrain comes with the latest MBUX infotainment system. The dual widescreen displays are sharp and intuitive, and voice controls make you feel like you’re in a sci-fi movie. And yes, it comes with Android Auto and Apple CarPlay. So no matter your tech allegiance, you’re covered.
Upgraded Infotainment System
The UI is smoother than ever, with crisp visuals and real-time map updates. You can control it via touch, voice, or the touch-sensitive steering wheel buttons—whichever feels most natural to you. Plus, there’s built-in navigation that even accounts for fuel consumption estimates and charger locations (just in case you’re eyeing that future electric car transition).
Connectivity Options For Tech-Savvy Drivers
Want to start the car from your phone? Check. Want to locate it in a crowded parking lot? Check. Need remote diagnostics or software updates? Double check. Mercedes is clearly thinking ahead, catering to tech-savvy drivers who expect their car to be as connected as their smartphones.
Safety And Driver-Assistance Systems
As expected, Mercedes leaves no stone unturned when it comes to safety. The E 400 d All-Terrain scores high in Euro NCAP ratings and comes loaded with sensors, radars, and cameras. Even the standard package includes emergency braking, lane-keeping assist, and blind-spot monitoring.
Advanced Driver-Assistance Technologies
The Mercedes-Benz E-Class takes driver-assist tech to the next level. Imagine cruising through traffic with semi-autonomous ease—yes, it can handle that. The adaptive cruise control doesn’t just follow the car ahead; it also keeps you centered in your lane, making long drives almost effortless. Stuck in a tight parking spot? The active parking assist steps in like a pro, maneuvering the car better than most drivers could.
What sets the E-Class apart is how naturally all this tech blends into your drive. It doesn’t feel robotic or intrusive—it just works, quietly and smoothly in the background. This is where innovation meets intuition, and it’s a big reason why the E-Class stands out in its segment.
Tech Highlights:
- Active Distance Assist DISTRONIC – smart adaptive cruise with stop-and-go traffic support
- Active Steering Assist – keeps you centered in your lane
- Active Parking Assist – handles parallel and perpendicular parking
- Traffic Sign Assist – recognizes and displays speed limits and road signs
- Blind Spot Assist – watches your flanks when changing lanes
Market Position And Competitive Edge
The E 400 d All-Terrain doesn’t just fill a niche—it defines one. For those who want an E-Class Wagon but also want that GLE SUV capability, this is it. It’s a smart alternative to both a sedan and an SUV, especially in places with rough roads or snowy winters.
Plus, it’s rare. You won’t see one on every street corner, which adds to the exclusive premium vibe. In a market filled with excellent options like the BMW 5 Series Touring, Audi A6 Allroad, and Volvo S90, the E 400 d All-Terrain carves its own lane.
It’s a quiet disruptor, effortlessly blending old-school diesel torque with cutting-edge tech and safety. So if you’ve ever dreamed of a car that can tackle backroads like a Subaru Outback, cruise like a Mercedes-Benz Cabriolet, and pamper like a GLE SUV, your dream just got a badge: E400d.
Pricing And Value Proposition
With a starting price hovering around €78,000 in Europe, it’s not cheap—but what you’re getting is a tech-loaded, diesel-powered luxury tourer with real-world practicality. Compared to the Audi A6 Allroad, BMW 5 Series Touring, or even the Volvo S90, it offers more torque, better off-road chops, and arguably the best cabin in its class.
Competition With Audi A6, BMW 5-Series, And Volvo S90
When you stack up the Mercedes E 400 d All-Terrain against its closest rivals, things get interesting. Each brings its own strengths—but only one truly masters the all-rounder game. Let’s wrap it up with a quick recap of how the E 400 d All-Terrain stacks up:
Bmw 5 Series Touring – The Sporty One
BMW’s Touring version of the 5 Series is a driver’s delight. It offers sharp handling, rear-biased balance, and a more dynamic edge. But when it comes to tackling rough roads or light trails, it doesn’t feel quite as at home. Its lower ride height and lack of serious off-road chops make it more of a tarmac star than a terrain tamer.
Audi A6 Allroad – Techy, But Aging
The A6 Allroad shares the same all-terrain ambition, with Quattro all-wheel drive and adaptive air suspension. It’s well-equipped and tech-savvy, but its infotainment is starting to feel a bit dated, and the torque figures don’t match the punchy inline-six in the E 400 d. It’s competent—just not class-leading.
Volvo S90 Cross Country – Elegant But Limited
Volvo’s S90 Cross Country is a beauty—elegant lines, plush interior, and a strong safety reputation. But while it brings style and peace of mind, it can’t compete with the E-Class on engine refinement, luxury feel, or tech sophistication. It’s lovely, but not as complete.
Why The E 400 D Wins
The E-Class All-Terrain blends confident performance, off-road readiness, and pure Mercedes polish. It’s the only one that truly feels at ease everywhere—from winding roads to muddy paths, and even the city commute. Refined, capable, and clever—it’s in a league of its own.
Conclusion
The Mercedes-Benz E 400 d All-Terrain is more than just another luxury wagon—it’s a refined response to drivers who want power, comfort, and go-anywhere confidence in one seamless package. With the legendary OM 656 inline-six diesel engine under the hood, it finally brings the soul of an S-Class to the rugged elegance of the E-Class All-Terrain.
It’s not trying to be an SUV, and it’s not just a lifted E-Class Estate. It’s something smarter—a luxury diesel E-Class that offers fuel economy, versatility, and a truly unique driving experience. Whether you’re exploring snowy mountain roads, commuting to work, or chasing the horizon, it delivers confidence in every gearshift and curve.
Frequently Asked Questions
1.What Engine Powers The New E 400 D All-Terrain?
The updated E 400 d uses the OM 656 inline-six diesel engine from the S-Class, delivering more torque, smoother performance, and improved fuel economy.
2.How Does It Compare To The E 350d Or E 220d?
It’s significantly more powerful and refined. The OM 656 engine offers faster acceleration, better sound insulation, and lower fuel consumption than older E-Class diesels.
3.What’s The Benefit Of The All-Terrain Variant Over The Standard E-Class Wagon?
The All-Terrain adds raised ground clearance, air suspension, protective cladding, and enhanced off-road modes, making it more versatile for rough roads or winter driving.
4.How Does It Compare To Competitors Like The Audi A6 Allroad?
It rivals the Audi A6 Allroad, BMW 5 Series Touring, and Volvo S90, offering more diesel power and comfort, while maintaining the signature Mercedes-Benz luxury feel.
5.Is This Model Part Of Mercedes’ Shift Toward Electrification?
While it’s a diesel engine, the E 400 d supports a mild hybrid drive system. It blends traditional power with future-forward tech as part of Mercedes‘ broader EQ Boost strategy.
6.Does The E 400 D Have Advanced Safety And Infotainment?
Yes, it features the latest infotainment system with Android Auto, real-time updates, and top-tier driver-assistance technologies that align with Euro NCAP standards.