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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 XT5 platform to underpin three-row crossover

Cadillac just launched the XT5 crossover to replace the SRX. But that's only the start. Speaking with Automotive News, Caddy president Johan de Nysschen confirmed that a new three-row crossover is also on the way. The seven-seater is based on a stretched version of the flexible platform underpinning the XT5, which we just drove recently. Taking that approach will give the luxury brand a larger crossover to pit against the likes of the Infiniti QX60, Audi Q7, and Volvo XC90 without having to develop one from scratch. It will also give buyers a more car-like alternative to the larger, truck-based Escalade. "It's one of the benefits of having this very flexible architecture. We can expand it, make it longer and wider. That gives us the ability to develop the car very quickly, as opposed to starting from scratch," de Nysschen told AN. "It's not running yet. It is a program request that we initiated with the engineers only last year. They are working at remarkable, record-breaking speed to get us the car." The new model would likely be called the XT7 and offer similar levels of equipment to the existing, smaller XT5. The existing mid-size model packs a 3.6-liter V6 mated to an eight-speed automatic transmission and comes in four trim levels. Related Video:

Cadillac ATS coupe and sedan get Midnight Editions

Horror stories and fairy tales make a mint by having the scariest things happen at midnight, but automakers make a mint by marketing midnight. Chevrolet busted out a Silverado Midnight Edition early this year, followed shortly thereafter by an Impala Midnight Edition. In between those two we got the Cadillac CTS Midnight Edition, and now comes an ATS following in the zero-dark-thirty tradition, according to GM Inside News. The ATS Midnight Edition will add $1,695 to the sedan price and $600 to the coupe. For that cash outlay you get black chrome on the grille, around the windows, and on the rear fascia, 18-inch "After Midnight" wheels, "sueded microfiber" trim on the steering wheel and shifter, plus the Cold Weather Package with a heated steering wheel and heated front seats. Just those few exterior changes make a big difference up front, increasing the appeal and aggression of the sports sedan without being ostentatious. You can't go dark with just any old ATS, though. The package is limited to rear- and all-wheel-drive versions of the Performance trim. And the color palette is reduced to four hues: Crystal White Tricoat, Red Obsession Tintcoat, Phantom Gray Metallic, and Black Raven. The three possible interior combos are Light Platinum with Jet Black accents, Morello Red with Jet Black accents, and Jet Black with Jet Black accents. Related Video: Featured Gallery 2015 Cadillac ATS Midnight Edition News Source: GM Inside News Design/Style Cadillac Coupe Luxury Special and Limited Editions Performance Sedan