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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.

Dodge Dart falls short of Consumer Reports Recommended, Caddy XTS and Lincoln MKS, too

The Dodge Dart, Cadillac XTS and Lincoln MKS all failed to earn a "Recommended" rating from Consumer Reports. When it came to the compact Dart, the organization's testers thought the vehicle offered a quiet cabin, solid-feeling chassis and nimble suspension, but the new model ultimately fell short of the coveted rating due to powertrain issues. The institute's reviewers found the base 2.0-liter four-cylinder engine to be underpowered and noted "drivability issues" when the available turbocharged 1.4-liter four was paired with the optional dual-clutch transmission (some of our editors disliked it paired with the six-speed manual). CR also dinged the latter powerplant for sounding "raspy." For what it's worth, we think the forced-induction engine offers an excellent and playful exhaust note, but that's just us.
As for the XTS, CR lauded the car for its luxurious cabin, but the vehicle's experience was dulled by its finicky CUE infotainment interface. Overall, the big Cadillac scored much higher than its cross-town rival from Lincoln. While testers found the American luxury sedan to offer a quiet ride and quality fit and finish, they felt the MKS delivered a "cramped driving position, ungainly handling, uncomposed ride, and limited visibility." Ouch. At the end of the day, both cars fell short of rivals from Japan, Germany and Korea. Check out the full press release below with more details, along with CR's musings on the Chevrolet Spark and Lexus ES.