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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.

2015 Cadillac Escalade gets 8-speed auto, range-topping Platinum Collection trim

The redesigned 2015 Cadillac Escalade is still quite fresh on the market, but the luxury brand has a host of mid-model-year updates for its massive luxury SUV that should make it an even better driver. The range-topping Platinum Collection (pictured above) is also all set to ensconce drivers in leather when it hits the road in the fourth quarter of 2014.
The entire Escalade range now gets an eight-speed automatic to replace the previous six-speed, and four-wheel drive models also get a two-speed transfer case to go along with it. New standard features include a Surround View camera system, 4G LTE connectivity, and the electric tailgate also now closes hands-free, in addition to opening that way.
To make riding in the Escalade an even more luxurious experience, Cadillac is adding a Platinum trim. Exterior changes add even more shine to the behemoth SUV with a grille wearing the redesigned brand crest, additional chrome trim, 22-inch wheels and Platinum badges. However, the interior is where things really get plush. The first and second row of seats are wrapped in Nappa, semi-aniline leather in a choice of either beige or gray. The dashboard, upper door panels and center console also get hand-stitched and wrapped leather, plus a suede microfiber headliner. Both front seats are heated and cooled with 18-way power adjustments, and the driver even gets a massaging function. Rear passengers are hardly left out, either, with 7-inch LCD screens in the headrests and a 9-inch screen in the center.

2015 Cadillac ATS sedan gets early reveal in making-of video

Cadillac is apparently preparing to roll out a minor facelift for the ATS sedan - which we know not because General Motors has already revealed it or because we're looking at it in a fresh batch of spy shots (though we've seen that too), but because a behind-the-scenes video from the filming of its commercial has leaked out online. Which may be bad news for Cadillac, and even worse news for the film production company, but good news for us, because we get to see it ahead of schedule.
The revised sports sedan seems to be sporting a new front bumper and less egg-cratey grille with Caddy's new wreath-less badge at its center, all apparently put in place to bring the sedan more in line with the new ATS coupe.
We're sure Cadillac will be revealing the updated 2015 ATS sedan shortly, but you can scope it out right now in the video below. By way of comparison, we've included an image gallery of the current ATS, released back in 2013, as well.