When the all-new 2010 Buick LaCrosse goes on sale this summer it will be more stylish and luxurious.

The LaCrosse, you may or may not recall, is a midsize sedan. Launched as a 2005 model, we liked it. And the new design is part of a plan by General Motors to revamp the Buick lineup much as it successfully did with the Cadillac lineup. The change to the Buick line started with the Enclave midsize crossover SUV, a vehicle that impressed us greatly.

Part of the GM's goal is to win younger, more affluent buyers for the Buick brand. The new LaCrosse was created with great attention to detail, craftsmanship and advanced technology, says Buick, and it builds on the success of Enclave and serves as the next step in Buick's renaissance.

The 2010 LaCrosse is built on the next generation of GM's global midsize car architecture, formerly known as Epsilon. The Buick LaCrosse is the first domestic car on the new platform, so it doesn't share with the Saturn Aura or Chevrolet Malibu, as you might suspect. Overseas, the Opel Insignia, which recently won the European Car of the Year award, uses the same architecture.

The new LaCrosse was developed globally. The architecture was designed in Europe, the interior styled in China, and the body design and vehicle integration completed in the United States. Compared to the outgoing model, the 2010 LaCrosse is about an inch shorter with a wheelbase that is 1.2 inches longer. This moves the wheels farther to the corners and results in a more athletic stance. The exterior styling employs cues of the Buick Invicta concept car shown at the Beijing auto show in China in 2008. The sculpted sides and waterfall grille are influenced by the Enclave.

Buick says the new LaCrosse will be the quietest Buick yet thanks to Quiet Tuning, which involves acoustic laminated glass, triple-sealed doors, liquid-sealed sound deadening, and special designs for the suspension bushings, engine cradle and mounts, and steering and induction systems.

The 2010 Buick LaCrosse will be offered in CX, CXL, and sporty CXS models. The V8-powered Super model will not return.

All models will use direct-injected V6 engines. Standard in the CX and CXL will be a new 3.0-liter V6 that will find its way into several other GM vehicles. In the LaCrosse, it will make 255 horsepower and 211 pound-feet of torque, and Buick estimates fuel economy ratings of 18 mpg city and 27 mpg highway.

The CXS model will come with GM's proven 3.6-liter V6, which will produce 280 horsepower and 261 pound-feet of torque in the 2010 LaCrosse. Buick estimates fuel economy numbers of 17/26 mpg for the CXS and says it will be capable of reaching 60 mph in less than seven seconds. Both engines will use a six-speed automatic transmission, and the CXS will have a manual shiftgate.

Front-wheel drive will be standard. The CXL model will also be available with an all-wheel-drive system with an electronic rear limited-slip differential that can send power side-to-side along the rear axle, which is a sophisticated setup.

CX models will have cloth seats and 17-inch wheels, while CXLs will be get leather upholstery, 18-inch wheels, dual-zone automatic climate control and fog lights. The CXS will heated and cooled seats and chrome-plated 18-inch wheels with optional 19s. Also standard on CXS will be a real-time damping system with three settings to adjust ride quality, as well as steering, throttle, and all-wheel-drive system calibrations.

That sounds all sounds very good. We loved the handling of the outgoing LaCrosse but thought the ride quality was a little choppy on rough metro freeways.

Inside, the 2010 LaCrosse will be more pleasant than the outgoing model, with real wood trim, blue-lit instrumentation and ambient lighting, and stitched leather trim on the dash. Other available features will include Bluetooth connectivity, a USB audio interface, a rearview camera, adaptive headlights, a head's up display, and GM's new Side Blind Zone alert system.