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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.

2015 Mercedes-Benz CLS400 [w/video]

Rocky IV debuted in 1985 but it was a few years later that I first watched it, on video. I loved every second of that terrible movie. I loved Drago's super-high-tech demonstration of punching power. I loved Rocky training in a Russian barn, with ropes, and yokes, and wagons. But mostly I loved Brigitte Nielsen. My 10-year-old brain sweated her impossible combination of curves and sharp edges, demure eyes, and sculpted bone structure. The perfect woman, but evolved by the power of the dark-hearted Soviet Union (or Denmark, whatever, I was ten). Red Sonja has a lot in common with the latest version of the Mercedes-Benz CLS, as I see it. Mercedes created a new market niche with its first four-door coupe, a sedan so well-proportioned, flowing, and femininely curved that it could pull off its inaccurate moniker. The third evolution of the CLS you see here has Nielsened up the shape into something altogether more angular and edgy, but like 1985's Brigitte, retains an undeniable sex appeal. It's a more opinionated piece of auto design than was the original CLS. And also a car that bifurcates the space between luxury coupe and luxury sedan. Ludmilla Drago would undoubtedly understand. Driving Notes For the base engine of a 4,200-pound car, the CLS400's two-turbo V6 does better than just get out of its own way. The full 354 pound-feet of torque is available way down at 1,600 revs, and plateaus until 4,000, giving you a fat band in which to call up power. Acceleration is available in the form of a quiet, gracious, but not aggressive push at just about every speed. From inside the cabin, the engine and exhaust noises are pleasantly rumbling, though muted. But do yourself a favor and try not to listen to the CLS tick over while standing around the driveway. When the car first pulled up in mine, warm from some 40 miles of highway, it still sounded an awful lot like a 2.0T on a mid-March morning. Not to belabor the Brigitte metaphor, but I found as much Neilsenian dichotomy in the ride and handling as I did the exterior styling. Especially with Mercedes' 4Matic system spreading out the grip, I found the CLS to be sharp when pushed, and rather excellent in terms of making quick corrections while under a cornering load. And yet, you've got to push through an initially soft suspension response to reach that hard edge. The CLS will initially resist being tossed around a winding backroad, but press on and she'll do as you ask.

2016 Mercedes-Benz G550 Quick Spin [w/video]

If there ever was an automotive embodiment of the phrase, "If it ain't broke, don't fix it," that'd be the Mercedes-Benz G-Class. The G-Wagen has carried on largely unchanged since the 1970s, with only small updates throughout the decades. Today, it's the halo vehicle for Mercedes' entire SUV range, and while it's more luxurious and efficient than ever, it'll still climb a mountain if asked. "Our legend has a bright future," says Dr. Gunnar Guthenke, Mercedes' G-Class boss. And for now, that means the addition of a new base engine for the 2016 model year, as well as other small updates. The powerplant in question is Merc's new twin-turbocharged, 4.0-liter V8 – you know, the one from the AMG GT – tuned to produce 416 horsepower and 450 pound-feet of torque in the G550. Compared to the outgoing, naturally aspirated, 5.5-liter V8, the new engine is stronger by 34 hp and 59 lb-ft. And while official fuel economy numbers are still pending, Mercedes says the G550 is 17-percent more fuel efficient with this smaller, more powerful engine. Win-win. As for the rest of the G-Class, the 2016 model year changes are limited to a new front bumper with more pronounced air intakes (and the removal of the cow catcher bars), wider wheel arches, a few new colors (including some seriously bright hues), and a redesigned instrument cluster. Those are all well and good, but the star of the show is that 4.0-liter V8. It's a honey in the AMG GT, and it's a perfect fit under the hood of the G550. Driving Notes I'm kicking myself for not taking video of the exhaust note, because holy crap, the G550 sounds amazing. Mercedes' engineers should be applauded for the exhaust tuning on the updated G-Class. The result is a low, burbly, throaty V8 noise that comes bellowing out the SUV's side pipes. The extra 59 lb-ft of torque is really noticeable off the line. And like in the AMG GT and C63, the 4.0-liter V8 provides linear power delivery with no noticeable turbo lag. Mercedes says the 2016 G550 will do 0-60 in 5.7 seconds, compared to 6.0 seconds in the 2015 model. That's right, it's a 5,724-pound, box-shaped SUV that'll run nearly neck and neck with a base Porsche Boxster. In terms of on-road refinement, the G-Class is the same as it ever was. There's an optional, adjustable suspension for 2016, with Comfort and Sport modes, but the difference between the two settings is negligible.