Buick’s LaCrosse is dropping its little-loved 3.0 V6 base engine in favor GM’s direct-injected 2.4 liter four-banger, probably so it can use the magic term “3o MPG highway” in forthcoming marketing. The downsides? You mean, besides having to move over 4,000 lbs with a 182 hp, 172 lb-ft engine (compared to the 3.0’s 255 hp, 217 lb-ft)? How about the fact that it brings the LaCrosse even closer to the forthcoming Regal? Buicks have long suffered from the fact that consumers see them as “Buicks,” rather than distinctive models, and cramped positioning like this is the reason why. But hey, someone’s got to make up for lost Pontiac volume at the Buick-GMC dealerships, so why not sell two cars on the same platform, starting at the same price point? Meanwhile, the Regal Turbo will not be available until the fourth quarter, and Regals with navigation won’t start to be built until the end of April. Buick’s sales are improving, but it’s still suffering from a number of very familiar Old GM symptoms.