Audi RS6 Avant vs Mercedes-AMG E63 S Wagon: The Super Wagon Battle

The RS6 Avant vs E63 S Wagon debate is the closest thing the American performance-car world has to a family feud. Both cars are German, both run twin-turbocharged 4.0-liter V8 engines, both send their power through all-wheel drive, and both can carry a week of luggage while embarrassing sports cars at a stoplight. Yet they come from very different philosophies, and they arrived in the US market by very different paths.

Mercedes-AMG has sold fast E-Class wagons in America, on and off, since the 2005 E55, building a small but fanatical following. Audi, by contrast, kept the RS6 Avant out of the US until the C8 generation finally landed for the 2021 model year. Today the Audi remains on sale in performance form, while the E63 S Wagon bowed out after the 2023 model year and now lives on the used market. In this guide, we compare the two on specs, driving character, practicality, reliability and value, and explain which super wagon makes more sense depending on how you plan to buy.

RS6 Avant vs E63 S Wagon: Two Roads to the Same Idea

The super wagon formula is simple: take a midsize executive estate, add a V8 with supercar output, and tune the chassis so the car can handle the power. What makes the RS6 Avant vs E63 S Wagon matchup interesting is how differently the two brands executed that formula.

The Audi approach

Audi’s C8 RS6 Avant is styled to look aggressive before it moves. Only the front doors, roof and tailgate are shared with the regular A6 Avant, and the flared fenders give it a wide, planted stance. Under the hood sits a 4.0-liter twin-turbo V8 paired with a 48-volt mild-hybrid system and cylinder-on-demand technology, an eight-speed Tiptronic automatic and quattro all-wheel drive. When the car arrived in the US for 2021, Audi rated it at 591 hp and 590 lb-ft, with a starting price of $109,000 before destination, according to Motor1’s coverage of Audi’s US pricing announcement.

For the 2024 model year, the US lineup switched to the RS6 Avant performance, which raises output to 621 hp and 627 lb-ft. Audi quotes 0-60 mph in 3.3 seconds, and the 2025 model starts at roughly $126,600, according to CarGurus.

The Mercedes-AMG approach

Mercedes-AMG took a more understated route. The S213 E63 S Wagon looks much like a regular E-Class estate with bigger wheels, quad exhaust tips and a more aggressive front fascia. That restraint hides a hand-built 4.0-liter twin-turbo V8 producing 603 hp and 627 lb-ft, an AMG Speedshift MCT 9-speed automatic and AMG Performance 4MATIC+ all-wheel drive. At launch for 2018, Mercedes-Benz USA priced it at $106,950 plus destination, according to the official Mercedes-Benz USA press release. By 2021, the base price had risen to $113,500.

Mercedes quoted 0-60 mph in 3.4 seconds. The 4MATIC+ system can also decouple the front axle in a dedicated drift mode, which turns a family estate into a rear-wheel-drive tire destroyer on a closed course.

Specs Comparison Table

The table below lists manufacturer and published data for US-market cars. Figures can vary slightly by model year and options.

On paper, the RS6 Avant vs E63 S Wagon numbers are remarkably close. Torque is identical, horsepower differs by less than 20, and the claimed acceleration gap is a tenth of a second. The real differences show up in weight, packaging and how each car delivers its performance.

Performance and Driving Character

Road testers have generally described the two cars as having distinct personalities, and that is where the RS6 Avant vs E63 S Wagon decision is usually made.

RS6 Avant: grip, stability and theater

The Audi feels engineered for relentless, all-weather pace. Quattro all-wheel drive and a sport rear differential help the heavy wagon rotate more eagerly than its weight suggests. The V8 has a deep, muscular soundtrack, and the eight-speed automatic is smooth in daily driving. The trade-off is mass: at close to 5,000 lb, the RS6 is the heavier car, and reviewers often note that it feels more like a high-speed cruiser than a scalpel on tight roads.

Depending on market and configuration, the C8 RS6 has been offered with adaptive air suspension or steel springs with Dynamic Ride Control. Owners generally describe the air setup as the softer daily choice, while the steel springs give a firmer, more connected feel.

E63 S Wagon: the hooligan in a suit

The Mercedes is often described as the more playful car. Its 4MATIC+ system is rear-biased in normal driving, and the drift mode gives it a party trick the Audi does not offer. The 9-speed MCT uses a wet start-up clutch instead of a torque converter, which helps shifts feel quick and direct. Hagerty praised its “sensational powertrain” and called it one of the best-executed vehicles on sale at the time.

Standard adaptive air suspension keeps the ride composed, and Mercedes retuned the Comfort setting for 2021 after owners reported that it felt too firm. The lighter weight also helps the E63 feel a little more agile when changing direction.

Practicality and Daily Usability

A super wagon still has to be a wagon, and this is a category where the Mercedes holds a measurable advantage. Mercedes-Benz USA lists about 35 cubic feet of cargo space behind the second row and around 64 cubic feet with the seats folded. Kelley Blue Book lists the RS6 Avant at about 30 cubic feet. For families hauling strollers, dogs or golf bags, that difference is noticeable.

The E63 S Wagon uses a 40/20/40 split rear seat, and both cars offer comfortable space for adults in the second row and luxurious cabins. The Audi’s interior is dominated by its dual touchscreen MMI setup, which looks modern but can be distracting while driving. The Mercedes uses a widescreen digital cockpit with a touchpad and, on later cars, steering wheel touch controls that some owners find fussy. Neither interior is perfect, but both feel appropriately premium for six-figure cars.

Fuel economy and running costs

Neither car is efficient. Both require premium fuel, and real-world economy for both typically lands in the high teens to low twenties mpg on the highway. Tires, brakes and insurance are significant expenses for each. Carbon-ceramic brakes were optional on both, and both can be very expensive to replace if the rotors wear out.

Reliability: What Owners Report

Reliability is a key factor in any RS6 Avant vs E63 S Wagon purchase, especially for used buyers who will own the car outside its factory warranty.

Audi RS6 Avant C8 known issues

According to owner reports compiled by PistonHeads and US recall data, the C8 RS6 has a few areas to check:

• A May 2021 recall covered cracked cylinder bore surfaces on some early 2021 cars, with engines replaced free of charge.
• Alternator and 48-volt mild-hybrid charging issues have been reported, and Audi extended warranty coverage on some alternators.
• Recalls also addressed fuel level senders and rear axle trailing arm locknuts.
• Owners have reported quattro sport rear differential oil leaks, as well as tailgate and door lock motor failures.

Mercedes-AMG E63 S Wagon known issues

The E63 S Wagon uses the same core powertrain as the E63 S sedan, so its strengths and weaknesses are similar. Owners’ forums commonly mention air suspension component wear as the car ages, along with the electronics gremlins typical of complex luxury cars. For a model-by-model breakdown, see our guide to Mercedes-AMG E63 S reliability and common problems by generation.

In both cases, a complete service history, finished recall work and a pre-purchase inspection by a brand specialist are more important than any general reliability ranking.

Pricing and Value in the US Market

Because the E63 S Wagon is no longer sold new, buyers in the RS6 Avant vs E63 S Wagon market are often comparing a new Audi against a used Mercedes. That changes the value calculation significantly.

Buying new

If you want a new super wagon with a factory warranty, the RS6 Avant performance is the only V8 option. Mercedes now offers the 2026 Mercedes-AMG E53 Hybrid wagon in the US, which uses a turbocharged inline-six plug-in hybrid with up to 604 hp in Race Start mode, according to Motor1. It is impressive, but it is a different kind of car than the V8 E63 S.

Buying used

Mercedes-Benz USA’s history shows that AMG wagons have always been sold in small numbers in America. The E55 wagon totaled just 126 units, and the S211 E63 wagon only 153. That rarity has helped the S213 E63 S Wagon hold its value better than many six-figure German cars, though prices vary widely by mileage, options and condition. Early 2021 RS6 Avants have also started to depreciate into a similar price range, creating a direct used-market showdown.

Buyer’s Advice: Who Should Buy Which?

After comparing the data, the right answer depends more on your priorities than on the spec sheet. Here is how the RS6 Avant vs E63 S Wagon choice usually breaks down.

Choose the Audi RS6 Avant if you want:

• A new car with a full factory warranty and current technology.
• Aggressive styling that looks special in every parking lot.
• All-weather stability and confidence in snow or rain.
• The most powerful version of the formula at 621 hp.

Choose the Mercedes-AMG E63 S Wagon if you want:

• More cargo space and a slightly lighter, more playful chassis.
• A sleeper look that does not attract attention.
• Drift mode and a rear-biased personality.
• A rare, collectible AMG wagon with a strong enthusiast following.

If you are still deciding whether a wagon is right for you, our feature on why the Audi RS6 Avant is the perfect family supercar and our broader AMG vs Audi RS comparison are useful next reads.

FAQ

Is the Audi RS6 faster than the E63 S wagon?

Based on manufacturer claims, the RS6 Avant performance is slightly quicker, with a 3.3-second 0-60 mph time compared with 3.4 seconds for the E63 S Wagon. In real-world testing, the difference is small enough that driver skill, tires and conditions matter more than the brand.

Is the Mercedes E63 S wagon still sold in the US?

No. The E63 lineup was discontinued in the US after the 2023 model year. Mercedes-AMG’s current US wagon is the E53 Hybrid, which uses a six-cylinder plug-in hybrid powertrain instead of a V8.

Which is more reliable, the RS6 Avant or the E63 S Wagon?

Neither car has a clear reliability advantage across all model years. The RS6 has had several documented recalls, while the E63 S Wagon’s age makes air suspension and maintenance history more important. A specialist inspection is essential for either car.

Conclusion: The RS6 Avant vs E63 S Wagon Verdict

The RS6 Avant vs E63 S Wagon rivalry has no losing side. The Audi is the better choice for buyers who want a new car, dramatic styling and maximum all-weather performance. The Mercedes-AMG is the enthusiast’s sleeper, with more cargo space, a playful drift mode and the rarity of a model that is no longer in production. If buying new, the Audi wins by default. If shopping used, the E63 S Wagon offers a uniquely charismatic package that many enthusiasts consider one of the best all-around performance cars ever sold in America. Whichever you choose, a family car has never been this fast.