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GM warning 800,000 owners that their cars may need oil changes more frequently than they say

The days of changing your engine oil every 3,000 miles are long gone thanks to most cars having automatic oil monitoring systems, but about 800,000 General Motors vehicles apparently have incorrect monitoring software that is leading to premature engine component wear. According to Autoweek, certain 2010-2012 Buick LaCrosse, Regal, Chevrolet Equinox and GMC Terrain models equipped with 2.4-liter four-cylinder engines could be going too long in between oil changes resulting in a higher-than-normal number of warranty claims for the engine's balance chain. The balance chain links the balance shaft to the crankshaft, and a worn one can produce higher noise levels.
As a fix, GM dealers will be reprogramming the software for the monitors in an effort to reduce the interval between oil changes, which varies based on driving habits and conditions. Through February 2015, the software update will be done at no cost to vehicle owners, but since this is not a recall, after that point, it will be up to the discretion of dealers as to whether or not they will charge for the service. What isn't immediately clear is whether GM plans on giving assistance to out-of-warranty customers who are experiencing engine issues from the worn chain.

These are the 'Greenest' and 'Meanest' cars in 2015

As has become tradition, the American Council for an Energy-Efficient Economy (ACEEE) has come up with a ranking of what it refers to as the "greenest" cars of 2015, and, by way of contrast, a list of the so-called "meanest" cars, so those who value eco-friendliness over all else can choose which vehicles they should or should not consider buying. As you may expect, electric cars make up the majority of the greenest cars on the list, but, perhaps surprisingly to many, the Tesla Model S didn't make the cut. It's worth noting, too, that where the electricity an owner uses to charge their electric vehicle has a big impact on its overall environmental impact. "A car that is charged using electricity generated from natural gas or renewables is going to have significantly less impact on the environment than one charged on a coal-heavy grid," says ACEEE lead vehicle analyst Shruti Vaidyanathan. The ACEEE's list for 2015 looks very different than it did in 2014. It's an interesting collection, though – and we're sure this goes without saying, really – we'd recommend doing a bit more research into each vehicle and how it might fit into your daily life before making any purchase decisions. Click here to see the ACEEE's list of the Greenest and Meanest vehicles sold in the United States in 2015. Green Bugatti Chevrolet Fiat GM GMC Mercedes-Benz Nissan RAM smart Toyota greenest greenest cars

GM cutting Chevy Sonic, Buick Verano production by more than 20%

General Motors' Orion Assembly plant in Michigan is seeing even more production cuts this year to further reduce inventories of the Chevrolet Sonic and Buick Verano. These latest adjustments mean layoffs for about 100 workers in phases starting in July. "GM Orion Assembly will adjust plant production capacity to better align with market demand," the company said in a statement announcing the change. Through May, sales of the Sonic are down 28.5 percent to 29,082 vehicles, and the Verano is off 15.6 percent, with 15,279 sold this year. According to unnamed plant insiders speaking to Automotive News, the assembly rate is slowing at Orion Assembly from the current 33 cars an hour down to 26 an hour, a 21-percent reduction. GM is also reportedly going to keep the plant idle for three weeks during the normal summer shutdown, rather than the usual two. Earlier in the year, the factory was idled for two weeks due to excess supply of the Sonic and Verano. In March, it was closed again for several days for the same reason. The Orion Assembly plant is the future home to the line for the Chevy Bolt EV. GM Statement: GM Orion Assembly will adjust plant production capacity to better align with market demand. A phased layoff of approximately 100 employees will begin in July 2015 and conclude by year-end. Related Video: News Source: Automotive News - sub. req.Image Credit: Bill Pugliano / Getty Images Plants/Manufacturing Buick Chevrolet GM Hatchback Sedan buick verano orion assembly