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How GM's grueling 24-hour test gets the kinks out of its performance cars

One of the biggest challenges automakers face when designing a high-performance car is making sure that it is both fast and reliable. For General Motors, any car that might be taken to the track by its owner - like the Corvette, Camaro Z/28 (shown above) and the Cadillac CTS-V, for example - undergoes a rigorous and strenuous 24-hour test by engineers at the Milford Proving Grounds, as pointed out by Car and Driver.
We've posted on this topic in the past - on a video showing the Camaro ZL1 being brutalized, for instance - but this article gives a more in-depth look at what actually happens behind the scenes... including what that poor ZL1 went through. Though the test isn't for 24 hours straight, the cars are pushed as hard as possible by some of GM's best drivers with only the brakes and tires replaced frequently.
We don't want to ruin the fun for you, but it is an interesting article that tells just some of what GM does to develop its sports cars. Check out the full article over at Car and Driver for the rest of the story.

Cadillac issues stop sale on ATS to recall 82k units

Cadillac is issuing a recall on 82,620 examples of the 2013-2016 ATS worldwide to fix a compliance issue with the sunroof controls. Until a service bulletin goes out to take care of things, there's also a stop sale on the luxury compact in the United States, The Detroit News reports. Of the affected models, 63,665 are in the US, according to a statement sent to Autoblog, and 7,922 of them are in Canada. The problem is actually the same issue as a recall on nearly 59,000 examples of the 2013-2015 ATS in the US in February. In them, the controls for the tilt and slide of the roof aren't recessed enough to meet government standards for the force necessary to operate the buttons. The Feds believe that someone could accidentally activate the auto-close and potentially be at risk. At the time, Cadillac dealers installed a new trim plate to add the needed clearance. In the latest update, the company is adding the 2016 model year, and according to The Detroit News, 70 percent of the cars from the original campaign also need another new trim plate. Unsurprisingly for such a minor defect, there are no known crashes, injuries, fatalities, or customer complaints related to this issue, according to the announcement by General Motors. Cadillac ATS Statement: General Motors is recalling 63,665 Cadillac ATS sedans in the United States from the 2013-2016 model years because the power-operated roof panel systems on these vehicles will auto-close when the non-recessed portion of the "Slide" or "Tilt" switches are pressed and the roof panel is open. Because these switches are not fully recessed, they can be actuated with less force than required to comply with applicable federal standards. GM knows of no crashes, injuries or fatalities related to this issue and has received no customer complaints. The total population of the recall including Canada, Mexico and exports is 82,620. Transport Canada Recall # 2015322 Recall Date 2015/07/21 Notification Type Compliance Mfr System Electrical Manufacturer Recall Number 15568 Units Affected The number of vehicles or components affected by the recall. 7,922 Category Car Recall Details Certain vehicles equipped with power-operated sunroof system may fail to conform to Canada Motor Vehicle Safety Standard (CMVSS) 118 - Power-Operated Window, Partition and Roof Panel Systems.

GM recalling 8.4M cars, 8.2M related to ignition problems

General Motors today announced a truly massive recall covering some 8.4 million vehicles in North America. Most significantly, 8.2 million examples of the affected vehicles are being called back due to "unintended ignition key rotation," though GM spokesperson Alan Adler tells Autoblog that this issue is not like the infamous Chevy Cobalt ignition switch fiasco.
For the sake of perspective, translated to US population, this total recall figure would equal a car for each resident of New Hampshire, Rhode Island, Montana, Delaware, South Dakota, Alaska, North Dakota, the District of Columbia, Vermont and Wyoming. Combined. Here's how it all breaks down:
7,610,862 vehicles in North America being recalled for unintended ignition key rotation. 6,805,679 are in the United States.