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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.

2018 Cadillac XTS V-Sport Drivers' Notes Review | Cruise missile

The XTS is a standout in Cadillac's current lineup. It's a throwback to the automaker's cars of the '90s and early 2000s. It's big, comfy and packs a punch under the hood, but there's only a slight pretense of sportiness, despite the V-Sport moniker. If you want a Cadillac that handles, buy a CTS or ATS. Still, there's nothing wrong with being a big, slightly soft cruiser. Not everyone is out to conquer the Nurburgring. Some people just want comfy seats and a half-mile of wheelbase. Our tester is the range-topping Platinum V-Sport trim. At $73,040, it's not exactly cheap. That said, you do get a hell of a lot for your money. This car has heated and cooled massaging front seats with 22-way power adjustment, a heated steering wheel, heads-up display, the latest version of Cadillac's infotainment system, Bose surround sound, LED headlights and adaptive cruise control. That's not including all the V-Sport goodies like Brembo brakes, magnetic ride and a howling 3.6-liter twin-turbo V6. Senior Editor, Green, John Beltz Snyder — Hopping in the Cadillac XTS, the familiar surroundings created a certain set of expectations. Like judging a book by its cover, it's an easy trap to judge a Cadillac by its interior (they all feel the same to me). Some of what I expected, I got: a smooth ride, hearty pep, robust driver assist and fussy audio and HVAC controls. What surprised me was just how urgent this motor is. On paper, that should come as no surprise. The V-Sport's 3.6-liter twin-turbo V6, making 410 horsepower and 369 pound-feet of torque, is bound to pack a punch. You almost forget what that should feel like, though, until you put your right foot down. There's no lag, and despite the all-wheel drive, there's even a little torque steer. The lightness of the steering means it's no difficult task to account for it, though. Speaking of steering, I actually enjoyed bending this through tight corners. It's a breeze to saw the tiller back and forth, and the car communicates the interaction between the tires — especially up front — with the road. I'd like to take this Caddy to the track. Associate Editor Reese Counts: I liked this car way more than I thought I would. I was expecting a DTS or STS with a fresh face and a bit more punch. In a way, that's what this is, but I don't mean that as a knock. I don't need every car I drive to be able to put down hot laps. Sometimes I want something with soft seats (that massage!) and a big engine to get me home quickly.

2019 Cadillac XT5 Sport package isn't really that sporty

Between the just revealed XT6 three-row crossover and last year's XT4 compact, the stalwart midsize XT5 has been a bit neglected. But Cadillac is giving it a little love at the Chicago show with the introduction of the Sport package. Don't get too excited, though, because this package is just a trim group. Outside, the XT5 with the Sport package gets a black grille, LED lights all around, and the rear lights have clear lenses. These design cues line up with the existing Sport trims on the XT4 and XT6. The new lighting and trim are complemented by 20-inch dark gray wheels and side steps. Inside, buyers get a choice between an all-black or black and gray upholstered interior with diamond-cut aluminum trim and aluminum pedals. And that's all the package adds. The suspension isn't retuned. The 3.6-liter V6 still makes 310 horsepower and 271 pound-feet of torque. But if the looks are enough for you, you'll be able to add the package to either the Luxury or Premium Luxury trim levels, which sit between the base XT5 and top-level Platinum. Related Video: