The twin-turbo 5.5-litre V8 will be replaced by the new twin-turbo 4.0-litre V8 from the Mercedes-AMG GT after next year
Andrew Frankel Autocar
19 January 2015

Mercedes-AMG’s 5.5-litre twin-turbo V8 engine will not be installed in any further Mercedes models after next year.

Despite only being introduced in 2011 and highly praised for its power, throttle response and sound, the M157 motor will be replaced by the new twin-turbo 4.0-litre V8 already seen in the Mercedes-AMG GT and about to be released in the new C63.

Despite its smaller proportions, the new engine is capable of delivering even more power than the M157, along with dramatically better fuel and emissions numbers.

The 5.5-litre engine will be used in the forthcoming GLE Coupé, revealed at the Detroit motor show, and its final application in a new car will be in the convertible version of the S-class coupé, which is due to break cover in 2016.

That said, given existing product cycles, it seems likely that the engine will remain in production until towards the end of the decade.

Get the latest car news, reviews and galleries from Autocar direct to your inbox every week. Enter your email address below:

Our Verdict

Mercedes-Benz S-Class

The self-proclaimed 'best car in the world' gets a touch more luxury, a heap of new technology and a mild hybrid electrical system, but is it enough to hold off the latest attempts from BMW and Audi?

Join the debate


19 January 2015
...on the grounds that it is a 4.0 litre and not a 6.3 litre, as per the stupid naming system currently in force?

Add your comment

Log in or register to post comments

Find an Autocar car review

Driven this week

  • Dallara Stradale
    The Stradale is the first road-legel car from Italian motorsport constructor Dallara
    First Drive
    16 March 2018
    The motorsport constructor's first road car is inspired by Lotus minimalism. Does it thrill on road and track?
  • Hyundai i30 N
    Standard spec is good so paint colour is our car’s only option
    First Drive
    16 March 2018
    What’s Hyundai’s first hot hatch and N-brand debutant really like? Let’s find out
  • Porsche Boxster GTS
    This is the new GTS version of the Porsche Boxster
    First Drive
    15 March 2018
    The 718-generation Boxster is our favourite roadster of the moment – so is this new GTS variant worth the extra outlay?
  • BMW 5 Series
    First Drive
    15 March 2018
    The BMW 5 Series is top of the mid-exec pack, but is there still room for a diesel saloon in everyday family life?
  • Audi A7 front
    First Drive
    14 March 2018
    The new Audi A7 Sportback looks the part, but how does the new Mercedes-Benz CLS rival cope on UK roads? We find out