Mercedes-Benz has now revealed that the 302 horsepower, 273 lb-ft of torque 3.5-liter direct-injection V6 found under the hood of the SLK350 will now work its way under the hood of the E350 as well -- a decision that should come as little surprise. This new engine sees a modest jump of 14 horsepower and 15 lb-ft of torque compared to the engine it replaces, and a new seven-speed transmission should further help to boost mpgs as well. The second previously unconfirmed E-Class model to receive an update for 2012 is the E550, which will see the 5.5-liter naturally aspirated engine from which it received its name replaced with a direct-injected, twin-turbocharged 4.6-liter engine. As is the case with the E350, this isn't the first time this engine has been revealed, as it was born in the CL550 coupe previously. It is worth noting, however, that for the E550, power comes in at just 402 horsepower and 443 lb-ft of torque, which still mark improvements of 20 horsepower and 52 lb-ft of torque, but fall short of the 429 horsepower and 516 lb-ft of torque produced from the 4.6-liter engine while under the hood of the much pricier CL550. The new engines (to the E-Class) also make use of start/stop technology, at least in Europe where it is calculated into official mpg ratings, and all told are good for as much as a 20 percent bump in fuel economy. As for the US.. hang tight, as these new engines won't be arriving until fall.
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