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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.

SRX-replacing Cadillac XT5 spied for the very first time

Cadillac has got big plans in place to revitalize its lineup, with new sedans, coupes and crossovers. And it all starts with this, the replacement for the SRX.
Expected to be called XT5 in line with the brand's new naming scheme, the crossover will be based on a scalable new platform called C1XX - or Chi, for short. In its shorter form, Chi is anticipated to underpin the XT5 as well as a new Chevy crossover and the next-gen GMC Acadia. In long-wheelbase form, the platform is slated to give us a larger Cadillac crossover as well as a new Buick Enclave and Chevy Traverse.
Power in the XT5 will be provided by a choice of turbo four or atmospheric six, potentially to be transmitted through GM's new nine-speed automatic.

Cadillac's XT6 is not, for better or worse, a mini Escalade

In its latest attempt at reinvention, Cadillac has created a trio of admirable sedans — the ATS, CTS, and CT6 — cars that challenge or beat the competition on their own terms, and do so with audacious exterior styling rendered in a distinctly American idiom. But American customers have been ditching cars in favor of high-riding crossovers, and what Cadillac has not had up until recently is a suite of appropriately (or bizarrely) sized crossovers to offer potential consumers, something competitors have been deploying for years or even decades. And so the new, full-size(ish) three-row Cadillac XT6, unveiled officially last week at an event in Detroit, is intended to help address the premier domestic automotive luxury brand's current product shortcomings. "I guess we had so many priorities and had to decide what's the most important thing," says Andrew Smith, Cadillac's executive director of design. "We decided to approach this one from an interior perspective, to do things like provide ease of use for owners, upgrade the infotainment, and allow time for ourselves to learn lessons from the launch of XT4." The XT6 doesn't exactly break any new ground within the segment, but that's not necessarily a criticism. Though huge from a sales perspective, the two-box crossover category is not the industry's leader in beauty or innovation. Still, Caddy's most recent previous crossover, the size-Small XT4, managed to create handsome proportions and a premium appearance at first glance. The XT6 doesn't feel quite so ambitious or coherent, with a front end that is at once sneering and soft, a lengthy flank that feints at muscularity without delivering, and a rather abrupt tailgate that blends the rectilinear and the anodyne. Maybe consumers won't notice? "Our biggest challenge was giving the vehicle a character that works on this scale and platform," says Smith. "We want to make sure all of our cars feel different. We didn't want it to be a mini Escalade. No one wants a mini anything. But we wanted to give it Escalade presence, but in scale. So it's this combination of nice, and aggressive. I'm convinced we will sell more than we think we'll sell." Maybe he's right, and we definitely don't see this vehicle cannibalizing sales of the Escalade. People who want a bold Cadillac can still get that one, and will have a brand new option later this year, we expect, when a new Escalade is released.