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Mercedes-Benz has been accomplishing miraculous feats of incredible horsepower with its large displacement engines. However, those engines haven't been particularly fuel efficient, so M-B is in the process of developing several new mills to meet new CO2 and fuel economy standards in Europe and the U.S.

Mercedes is reportedly adding a new, direct-injected, twin-turbo 4.7-liter V8 engine this fall with an impressive 435 horsepower and 516 pound-feet of torque. The German automaker claims a fuel economy improvement of 22 percent versus one of its last-generation engines outputting a similar amount of power. Those impressive gains come courtesy of the aforementioned direct injection, stop/start technology and more efficient components like the fuel and water pumps. The twin-boosted V8 will reportedly arrive this fall in the CL-Class and S-Class.

Also up for an overhaul is Mercedes' 3.5-liter V6. The new mill will have an all-new 60 degree V block with new intake and exhaust. The sum of these changes is 306 horsepower and 273 lb-ft of twist, and a reported fuel economy savings of 24 percent in the not-for-U.S.-consumption S350. The new 3.5-liter will be an especially welcome addition to the Mercedes lineup, as the current 268 horsepower engine isn't exactly keeping up with similar displacement engines available from Lexus, Infiniti, Cadillac and Acura.

Keep in mind that Mercedes isn't listing official EPA numbers when its touting its new engines' improved efficiency, and Inside Line points out that the EPA rating system doesn't really account for Stop/Start systems in its fuel economy averaging.

[Source: Inside Line]


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  • 26 Comments
      • 4 Years Ago
      306hp, no turbo lag and better fuel economy?

      Yes please.

      Those figures are actually very similar to the V6 Mustang...
        • 4 Years Ago
        So finally the Germans are catching up to Ford.

        lol
      • 4 Years Ago
      There's a motor underneath all of that?
      • 4 Years Ago
      Wasn't the r171 SLK refreshed to output 300+ bhp from the 3.5 v6 last year? this engine is already available in the 2009 SLK 350. What did I miss here?
        • 4 Years Ago
        My bad...the m272 was a 90 degree v6. The new 3.5 v6 will be 60 degree. Smooth v6 without needing the existing balancer shaft.
      • 4 Years Ago
      looks*
      • 4 Years Ago
      Another 90 degree V6 bites the dust, I've always thought they sounded better than 60 degree V6's.
      • 4 Years Ago
      gonna miss the old 6.2amg engine
        • 4 Years Ago
        I don't think AMG is gonna dump the 6.2 for fuel economy. The naturally aspirated engine just sounds too good.
        • 4 Years Ago
        @ Kyle

        It's already been said that the 6.2L is going to be dropped for a new 5.5L Twin-Turbo V8 which produces more hp and more torque. Better get one while they're still around...
      • 4 Years Ago
      For decades, Mercedes has brainwashed people into thinking over-priced Mercedes vehicles have high technology and unsurpass quality. The gig is up. Not surprisingly, even Hyundai's V-8 introduced in the Genesis and Equas is pound for pound more efficient than any Mercedes V-8 has to offer.
        • 4 Years Ago
        You should do your research before you start making such claims. Technology such as ABS, navigation, infra-red night vision, air bags, heated seats etc. were developed by Mercedes first and then eventually showed up in other manufacturers. It's so well known even Top Gear admitted it when they talked about the S-Class and that's why Jeremy Clarkson has one.

        Just because a lot of manufacturers have caught up doesn't mean Mercedes is behind, they're just on par at minimum. Besides if you think that then you've never driven a Mercedes. Go drive one first. I have a BMW and a Mercedes and there is no comparison to the way they drive and feel.
      • 4 Years Ago
      Good. Mercedes V6s are lagging behind the competition. I assume if they're getting rid of the old 3.5L, they'll also be using a new 3.0L? Their 3.0 is about 40 horsepower behind GM's 3.0, and the C-class only offers all wheel drive with the 3.0, not the 3.5.
      • 4 Years Ago
      This is a good time to be a car fan. 200 hp I-4's, 300 hp V-6's, 400 hp V-8's.. awesome. Clean running and pretty good mpg, too. Awesome.

      And that is before turbocharging, in many cases.

        • 4 Years Ago
        Spectacular powertrains, yes.

        Installed in spectacularly overweight crash cocoons with non defeat stability control.

        To be driven on increasingly congested highways with more cameras going up every day.
      • 4 Years Ago
      The new V6 seems pointless.

      Mercedes could have added direct injection to the 3.5 HO engine (300hp, 265ft-lbs) and returned to a dual length intake runner system. Target 300ft-lbs from 3.5 liters.
        • 4 Years Ago
        The new V6 not only sounds pointless, it sounds eerily similar to Nissan's (MB's new partner) VQ engine from the 07 G35: 302 hp/268lb/ft torque. And that was 4 years ago...
        http://en.wikipedia.org/wiki/Nissan_VQ_engine#VQ35HR
        • 4 Years Ago
        Actually, its has almost the exact same power as the Toyota 2GR-FSE, which has been around since 2005. It is 306 HP and 277 ft/lb on a Lexus IS 350...only difference is 4 ft/lb torque!
        • 4 Years Ago
        Exactly. They could have added start + stop too.

        It could be a better engine than Ford/GM's larger v6.

        They get a big fat fail for this one.
        • 4 Years Ago
        I love the new V8 for regular version Mercedes. The AMG's will be getting a TT 5.5L, which will be -- and this is hard to believe -- even better than the current 6.2L

        But, MB should have gone further on the V6, simply to one-up BMW. BMW's turbo 6 is one terrific engine, and it puts to shame Mercedes.

        • 4 Years Ago
        Actually I just went over all the other articles from before and apparently the lineup for the next generation of engines is a naturally aspirated 3.5L unit (which appears to be this one) and then a smaller displacement engine with twin turbos to take on the 335i.

        So this could possible be the base engine?

        If so, this definitely isn't a "fail".
      • 4 Years Ago
      Mercedes-Benz S470? or more likely... S450 like the 450SEL from the 70s. Or they might just call it the S500 again, Im ok with either, espically S500... S470 sounds... different...
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