Mercedes E-Class W213 vs Audi A6 C8 used at £25-35k: which executive saloon wins in 2026

The W213 E-Class arrived in UK showrooms in spring 2016 and ran in two clear phases.

The W213 and the A6 C8: how each generation evolved

The W213 E-Class arrived in UK showrooms in spring 2016 and ran in two clear phases. The pre-facelift 2016-2020 launched with the COMAND infotainment system on twin 12.3-inch screens (optional from launch, standard on AMG Line from 2018), the OM654 2.0-litre four-cylinder diesel debuting as the E220d, the 9G-Tronic automatic across the range, and a saloon, estate and All-Terrain estate body. The facelift 2020-2024 brought MBUX with steering-wheel touch controls, the new “Energizing Comfort” software suite, the 48-volt EQ Boost mild-hybrid system on the petrol four-cylinder and the M256 inline-six petrols, a sharper face with redesigned headlamps and the option of the OM654M evolution of the diesel.

The A6 C8 launched in mid-2018 on the Volkswagen Group MLB Evo platform shared with the Audi Q7 4M, Bentley Bentayga and Porsche Macan. It is, fundamentally, a single-generation car with the same dual-touchscreen MMI Touch dashboard throughout – the lower screen handles climate and shortcuts, the upper one navigation and media, both with haptic-feedback “click” responses. The C8 was sold in saloon, Avant (UK estate) and Allroad bodies, with the 40 TDI 2.0 diesel mild-hybrid as the volume engine, the 45 TFSI 2.0 petrol mild-hybrid as the lower-volume sibling, the 55 TFSI e PHEV from 2020, the 50 TDI 3.0 V6 diesel as the long-distance choice, and the S6, RS 6 Avant and RS 6 Avant performance variants. C8 production ran through to 2025 in the UK, with the successor C9 launched in 2025 as a different platform.

Engines compared: W213 vs A6 C8 (diesel, petrol, PHEV)

The W213 line-up most UK used buyers see in the £25-35k bracket is built around the E220d (2.0 OM654 diesel, 194 PS, the volume car), the E300d (2.0 OM654 diesel, 245 PS), the E300de (2.0 diesel plus electric motor PHEV, combined 306 PS), the E300e (2.0 petrol plus electric motor PHEV, combined 320 PS), the E350 4Matic (2.0 petrol, 299 PS, all-wheel drive on facelift cars), and the E400d 4Matic (3.0 inline-six diesel, 340 PS). The 400d is the connoisseur’s pick if you find one but is rare and creeps over the £35k cap; the 220d is the everyday motorway-friendly buy.

The A6 C8 catalogue at this price runs 40 TDI (2.0 four-cylinder diesel mild-hybrid, 204 PS, the volume car), 45 TFSI (2.0 four-cylinder petrol mild-hybrid, 245 PS), 55 TFSI e (2.0 petrol PHEV, combined 367 PS, AWD), 50 TDI (3.0 V6 diesel mild-hybrid, 286 PS, AWD), the S6 TDI (3.0 V6 diesel with 48V-powered electric compressor, 349 PS – UK-spec was diesel) and the rare RS 6 Avant (4.0 TFSI V8 petrol, 600 PS, over the £35k cap in 2026 unless tatty).

Reliability and DVSA recalls: how the two stack up

What Car’s Reliability Survey has consistently ranked the W213 E-Class in the middle of the executive saloon class, with the four-cylinder OM654 diesel rated more reliable than the inline-six M256 petrol and the M177 V8 AMG units. Honest John’s owner submissions echo that: 331 W213 submissions returned an aggregate real-world figure that beats WLTP on the volume E220d, which is a strong reliability signal in itself – cars that aren’t running properly don’t post 108% of official MPG. The known faults at 60,000-80,000 miles on the W213 cluster around the 9G-Tronic transmission software (a recurring “jerky shift” complaint resolved by Mercedes-Benz over-the-air or dealer-visit software updates), the MBUX touch-pad sensitivity on post-facelift cars, and the OM654 diesel’s AdBlue NOx sensor and tank pump – the same Volkswagen-Group-wide story that hits the OM654’s diesel cousins.

The A6 C8 has the same MLB Evo 3.0 TDI architecture as the Audi Q7 4M, so it inherits the Q7’s AdBlue tank-and-sensor history on the 50 TDI. The 40 TDI 2.0 four-cylinder mild-hybrid is the more troublefree engine of the two; What Car owner notes flag the MMI Touch dual-screen system as the most-complained-about C8 weak point, with ghost-touch faults reported on early 2019 cars resolved by an MMI software flash. The 48-volt mild-hybrid 12V battery on the 40 TDI is a genuine maintenance cost – failure means stop-start stops working and the dashboard throws a “battery requires charging” warning; replacement is around £350-£500 at a main dealer, less at a specialist. Always run the VIN through the DVSA recall checker at gov.uk/check-vehicle-recall before viewing either car – W213 has had recalls touching brake-line corrosion and SRS / airbag wiring on early build dates, and the A6 C8 has had recalls on coolant-pump wiring and 48V battery-mounting bolts on 2019-2020 cars.

Interior, infotainment, kit: MBUX vs MMI Touch

On a pre-facelift W213 (2016-2020) the COMAND system is showing its age in 2026 – it’s responsive enough but the graphics are first-generation, the rotary controller and touchpad combination is a step behind the touchscreen norm, and Apple CarPlay / Android Auto support is patchy on the earliest UK cars (added by software updates from 2018). The facelift W213 (2020-2024) is a different story: MBUX dual 12.3-inch screens, steering-wheel touchpads either side of the cluster, “Hey Mercedes” voice control, wireless CarPlay and Android Auto across the range. The touchpads divide opinion – some owners love them, others find them too sensitive on bumpy roads.

The A6 C8 had MMI Touch dual-screen from launch in 2018 and has aged better than the pre-facelift W213’s COMAND – the haptic “click” feedback on the lower screen and the clean menu logic both age well in 2026. The Virtual Cockpit instrument display is the segment benchmark for digital clusters, with full-screen mapping, multiple layouts, and clean typography. Where the Audi loses ground to the facelift W213 is voice control (Audi’s voice assistant is less natural-language than “Hey Mercedes”) and over-the-air updates (Mercedes pushes more software updates remotely; Audi requires more dealer visits for MMI flashes). On kit, S Line and Black Edition A6 C8 cars come with leather sports seats, three-zone climate, full LED matrix lighting, the Bang & Olufsen optional system on many used examples; AMG Line W213 cars match all of that and add the AMG steering wheel and the more aggressive bumpers.

Used pricing in 2026 (£25-35k market)

Carwow and Auto Trader inventory scans in May 2026 show roughly 1,400 W213 saloons and 380 W213 estates within the £25,000-£35,000 band, against around 1,100 A6 C8 saloons and 520 A6 C8 Avants. The clearest 2020-2022 facelift W213 E220d AMG Line saloon with 30,000-50,000 miles and Mercedes-Benz Approved Used cover sits at £27,000-£31,000; the equivalent Estate runs £28,500-£33,000 due to the smaller pool and family demand. A 2020-2022 A6 C8 40 TDI S Line saloon with similar miles and Audi Approved Used history is £26,000-£30,000; the Avant in the same trim and miles is £28,000-£33,000. The 50 TDI A6 C8 quattro premium is around £3,000-£4,000 on top of the 40 TDI of the same year and miles, which prices most 50 TDIs out of the £35k cap once they’re under 50,000 miles.

PHEV pricing has softened most aggressively. A 2020-2021 E300de PHEV saloon with 40,000-50,000 miles is £25,000-£28,000 (compare with £55,000+ when new), and the equivalent A6 55 TFSI e is £26,000-£30,000. Whether the PHEV maths work depends entirely on how often you charge and your benefit-in-kind position; see our GAP-after-the-FCA-pause guide if you’re financing and protecting against the steeper depreciation curve PHEVs carry. For finance structuring on either car, our PCP vs HP UK 2026 walk-through covers the Approved Used finance offers from both Mercedes-Benz and Audi against high-street HP. New MOT testing changes (covered here) added emissions checks that bite older diesels harder than petrols – factor that into the W213 220d / A6 40 TDI cost-of-ownership picture; and if you’ve taken finance on either, our PCP early settlement guide walks through how the maths work in 2026.

Verdict: which to buy for what use-case

If you do high-mileage motorway runs and value a quieter, plusher cabin, the W213 E220d is the easier car to live with. The Honest John 52.1 mpg real-world average (108% of WLTP) is a striking number and lines up with the typical 50,000-mile-a-year company-car owner saying “the diesel just keeps going”. The estate is the connoisseur’s pick – saloon-like roofline but a usefully larger boot – and the facelift MBUX dual-screen system is the cleanest in-cabin tech of any £25-35k executive in 2026. Pre-facelift COMAND cars feel five years older in 2026 than they actually are; bias the budget toward a 2020-2022 facelift.

If you weight driving feel and infotainment a bit higher and don’t mind a slightly firmer ride on 19-inch wheels, the A6 C8 40 TDI S Line is the better-aged car. MMI Touch with its haptic dual-screen is genuinely satisfying to use, the Virtual Cockpit is the segment standard, and the 40 TDI mild-hybrid hits 96% of WLTP in owner data – close to the W213 but with sharper steering. The Avant is genuinely more useful than the W213 estate at the back end. Avoid the 50 TDI unless you can verify a complete AdBlue / DPF service paper trail; the 3.0 TDI inherits the Q7’s known weak point. Best-of-both-worlds buy: a 2020-2022 40 TDI Avant in S Line trim with full Audi service history and 30,000-50,000 miles, in the £28,000-£33,000 bracket.

Our take

This is one of the few used-executive comparisons where the answer genuinely depends on use case rather than absolute price-for-equipment. The W213 facelift E220d is the easier daily car – quieter, plusher, with the Honest John 108%-of-WLTP real-world economy that almost no other 2.0 diesel hits, and a facelift MBUX cabin that’s aged remarkably well. The A6 C8 40 TDI is the sharper drive with the better-aged digital cabin and a more useful estate at the back end. Neither is the “right” answer in absolute terms; both are within £1,000-£2,000 of each other at the £28,000-£32,000 sweet spot, and both reward an Approved Used purchase over a private one (Mercedes-Benz Approved Used and Audi Approved Used both carry minimum 12-month warranties with European cover). What we would NOT do is reach for the 50 TDI A6 or the E400d at the top of the budget unless you can verify documented AdBlue / DPF / 9G-Tronic software work in the file; the £3,000-£4,000 premium over the four-cylinder cars buys you more headline performance but more wear on the higher-output drivetrains. Run the VIN through gov.uk recall search, plug an OBD scan tool in at viewing, and read the most recent two services in detail before depositing.

Related reading

• PCP vs HP in the UK in 2026 – structuring finance on a £25,000-£35,000 Approved Used executive saloon.
• UK GAP insurance after the FCA pause lifted in 2026 – whether the dealer’s GAP top-up still makes sense on a depreciating premium saloon.
• New MOT rules in the UK for 2026 – emissions checks that bite the W213 220d and A6 40 TDI harder than the petrol cars.
• PCP early settlement in the UK in 2026 – exit maths if you’re carrying finance on a used executive saloon.
• Best diesel SUV for UK towing in 2026 – if your need is the towing 2,100 kg, the SUV options that out-tow these saloons.
• All CDE buying guides.