General Motors' all-new 3.9L V6 has been honored with a Breakthrough Technology award by Popular Mechanics for its innovative use of variable valve timing in an overhead valve engine.

Sure, it's possible to argue about the long-term benefits of ethanol, but GM's announcement that their new 3.9L V6 engine will be a flexible fuel engine is the less exciting of the two bits of news.

A Step-By-Step Guide The Alfa V6 is from the same engine family as the Ferrari F154 3.9-liter twin-turbo V8, so it shares many of its characteristics but in a scaled-down package with two fewer ...

The new 3.9L V6 offers increased power in lower trim levels, while the Super model, with its sportier tuning and Northstar V8 engine, does much to break away from the staid image of Buicks past.

Prices shown for the used 2007 Chevrolet Impala Sedan 4D LT 3.9L with NaN miles are what people paid to buy this vehicle or what people received when trading in this vehicle at a dealer. Edit options.