General Motors has released new information on its top-of-the-line 2012 Buick LaCrosse equipped with a new and more potent version of its direct-injected 3.6L V6 engine that joins the freshly released standard 2.4-liter four-cylinder engine with eAssist, which we’ve already told you about in a previous article.

For the 2012 model year, the direct-injection 3.6-liter six-cylinder unit has been upgraded with several new features including a different cylinder head design, larger-diameter intake valves in the heads and new, longer-duration intake camshafts.

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Starting this summer, Buick will offer the 4-cylinder LaCrosse sedan with the eAssist micro-hybrid technology as standard. The LaCrosse eAssist uses a variety of systems and body modifications to deliver an estimated fuel economy rating of 37 mpg on the highway and 25 mpg in the city (pending EPA certification).

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In the latest round of safety recalls, General Motors has issued a warning on certain 2011MY Buick LaCrosse sedans and Cadillac SRX crossovers due to a software glitch that may disable the driver’s ability to adjust the settings on the hearing, ventilation, and air conditioning (HVAC) systems.

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Starting from next summer, all versions of the Buick LaCrosse with the 2.4-liter four-cylinder unit will be fitted with GM's eAssist mild hybrid technology as standard, the automaker announced today. The 2012MY LaCrosse will make its world premiere this week at the Los Angeles Auto Show.

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