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Mercedes-AMG to phase out 5.5-liter V8 after next year [UPDATE]

UPDATE: A previous version of this story indicated that AMG's 6.0-liter twin-turbo V12 was still mated to a five-speed automatic transmission, however the latest models (including the S65 AMG sedan and coupe, SL65 roadster and G65 sport-ute are equipped with the newer seven-speed unit. Mercedes also reached out to point out that the 5.5-liter engine will be phased out gradually, not overnight. There's a lot to love about AMG's 5.5-liter twin-turbo V8. It produces as much as 577 horsepower and 590 pound-feet of torque, and delivers blistering performance to even the heaviest of vehicles. But try not to get too attached, because like its 6.2-liter, naturally aspirated predecessor, it's not long for this world. The latest word comes from Autocar, which reports that Mercedes will release the last applications for the 5.5 biturbo within these next two calendar years in the new GLE63 AMG and upcoming S63 AMG convertible. After that, even though it was only introduced in 2011, it will be phased out. Fortunately Affalterbach has a worthwhile successor already in place in the 4.0-liter twin-turbo V8 from the Mercedes-AMG GT. The smaller powerplant, already in store for the new C63, is already producing 503 hp and 479 lb-ft in S spec. That's still shy of the larger unit's output, but where the 5.5 is nearing the end of its production cycle, the 4.0 is just starting out. Of course the 4.0-liter biturbo isn't the only engine AMG is making these days. Smaller models (based on the front-drive platform) employ the 45-designation, high-output 2.0-liter turbo four. Models at the very top of the lineup, however, use a 6.0-liter twin-turbo V12 that may be a dinosaur, but with 621 hp and 738 lb-ft of torque on tap, still can't be beat.

Mercedes-AMG developing halo car with new 12-cylinder engine

The SLS AMG was once the jewel of the Mercedes-Benz performance lineup, a commanding supercar the presence of which could be felt a football field away. The AMG GT has taken that crown with its seductive 4.0-liter V8 biturbo engine – a veritable bulldog cloaked in an alluring silhouette. But Mercedes was always clear: this was a Porsche 911-fighter. It was even called a "baby SLS." Now it appears in the world of three-starred performance halo-cars, Mercedes may be playing its own Game of Thrones. To be clear, the GT will remain top dog for some time to come, and that lineup "will expand," we're told. A Black Series is still at least a year or more away, and we could see another model in the AMG GT family beyond that. But a recent conversation with a Mercedes-AMG product planner in Austria revealed that a new halo car is in the works, one that will slot above the GT. It will likely draw power from a new 12-cylinder that's now in development, one that will be mated to an electric motor and battery pack. This ultra-hybrid setup could boast the greatest performance of any Mercedes yet. Crucially, it will have better fuel economy, good enough to justify its existence in an increasingly stringent regulatory environment. As for the new 4.0-liter V-8 in the AMG GT, you can expect to see a lot more of it, starting with the E63 AMG, sometime after the next Mercedes-Benz E-Class launches next year. Related Video:

New York Auto Show Special with the Ram REV, Kia EV9 and more | Autoblog Podcast #775

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Road Test Editor Zac Palmer. They start off with what it was like to be at the New York Auto Show, then provide analysis on all the big reveals. The big reveals touched on include the 2025 Ram REV, 2024 Kia EV9, Genesis GV80 Coupe Concept, 2024 Hyundai Kona variants, 2024 Subaru Crosstrek Wilderness and 2024 Jeep Wrangler. They also touch briefly on some non-NY news with a refresh of the Mercedes-Benz GLS-Class. Lastly, the two discuss the cars they've been driving, including the 2023 Mercedes-AMG EQE and our long-term Toyota Sienna minivan. Autoblog Podcast # 775 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown NY Auto Show 2025 Ram 1500 REV packs 650 horsepower, up to 500 miles of range Kia EV9 targets 300 miles of range, U.S. production at NY Auto Show Genesis GV80 Coupe Concept is coming to reality 2024 Hyundai Kona Electric and gas variants revealed with full specs at NY Auto Show 2024 Subaru Crosstrek Wilderness takes the hatchback to literal new heights 2024 Jeep Wrangler reveals more tech, refinement — and a cheaper 4xe News 2024 Mercedes-Benz GLS-Class gets a light update What we're driving 2023 Mercedes-AMG EQE Long-term 2023 Toyota Sienna Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. 2025 Ram 1500 REV packs 650 horsepower, up to 500 miles of range