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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.

These are the 'Greenest' and 'Meanest' cars in 2015

As has become tradition, the American Council for an Energy-Efficient Economy (ACEEE) has come up with a ranking of what it refers to as the "greenest" cars of 2015, and, by way of contrast, a list of the so-called "meanest" cars, so those who value eco-friendliness over all else can choose which vehicles they should or should not consider buying. As you may expect, electric cars make up the majority of the greenest cars on the list, but, perhaps surprisingly to many, the Tesla Model S didn't make the cut. It's worth noting, too, that where the electricity an owner uses to charge their electric vehicle has a big impact on its overall environmental impact. "A car that is charged using electricity generated from natural gas or renewables is going to have significantly less impact on the environment than one charged on a coal-heavy grid," says ACEEE lead vehicle analyst Shruti Vaidyanathan. The ACEEE's list for 2015 looks very different than it did in 2014. It's an interesting collection, though – and we're sure this goes without saying, really – we'd recommend doing a bit more research into each vehicle and how it might fit into your daily life before making any purchase decisions. Click here to see the ACEEE's list of the Greenest and Meanest vehicles sold in the United States in 2015. Green Bugatti Chevrolet Fiat GM GMC Mercedes-Benz Nissan RAM smart Toyota greenest greenest cars

Next Aston Vantage will be the only way to get an AMG V8 with a stick

With only a few exceptions, most of them factory customs, AMG hasn't built cars with manual transmissions. It just isn't the way things are done in Affalterbach. But now that Mercedes's in-house speed shop will be supplying engines to Aston Martin, the world will be treated to cars with three pedals and overengineered German V8s wrapped in a pretty British package. We're into it. The news comes from Car and Driver, which spoke to Aston Martin CEO Andy Palmer about the new Vantage among other things. Palmer confirms to C/D that the Vantage will continue to offer manual and automatic transmissions when the next-gen car arrives featuring the AMG 4.0-liter twin-turbo V8. In its most potent form, the eight-cylinder makes 503 horsepower and 479 lb-ft of torque in the AMG GT S. Figure on a little more from the Aston-ized version, just for fun. The current V8 Vantage GT makes 430 hp and 361 lb-ft from its naturally aspirated 4.7-liter. While some may lament the new engine's forced induction, that added power and the thoroughly modern behavior of the AMG engine should be welcome. While the AMG V8 is currently only planned to go into Aston's entry-level car, C/D does mention a possibility of it (and perhaps its three-pedal transmission) making its way into other cars as an economy option for certain markets. If a V8 DB11 were to be offered, don't expect it to show up here, though. There's also no word on who will supply the manual for the AMG-Aston mashup, but it likely will be a transaxle like the current Vantage. Ex-factory manual AMGs aren't totally unprecedented. Pagani has built some three-pedal cars with its massaged AMG V12s. Compared to those, however, these manual Vantages can be considered mass-production cars. And really, any increase in the number of sticks mated to AMG engines can only be a good thing. Related Video: News Source: Car and Driver Aston Martin Mercedes-Benz Coupe Performance mercedes-amg confirmed aston martin v8 vantage aston martin vantage