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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 CT6 to get twin-turbo V8

Say what you will about his decisions at Infiniti and now Cadillac, but Cadillac CEO Johan de Nysschen knows how to deliver a compelling interview. During an online Q&A session with Jalopnik readers, de Nysschen offered substantial hints at what's coming for the brand. By dropping coordinates on the brand's star chart, in reading the entire thing and connecting the dots you can see a Cadillac that is much grander than the one we know now. The CT6 that got revealed during the Oscars telecast? Answering the question of whether it would have the performance to compete with a Mercedes S550 or BMW 750, de Nysschen said the big sedan's "lightweight body structure allows us to achieve formidable performance even with a twin-turbo V6. Imagine how this car would perform with a twin-turbo V8." In clarifying a subsequent question that also dealt with how the CT6 would compare to German rivals, he wrote that the CT6 would have "a very wide mix of engines, starting with a two-liter turbo, up to, eventually, a high-performance advanced V8 turbo." Patience and the future and the word "eventually" were heavy themes. The brand will embrace diesel engines as well, de Nysschen writing, "We will have four-cylinder and six-cylinder diesel engines, but not before 2019." As to the return of something like the XLR, which was Corvette muscle underneath a Cadillac body, he wrote, "I think in the fullness of time, we will get around to developing a high-performance, very-emotive sports car as a halo for the Cadillac brand. But we have so many projects to occupy us through 2020 that this will have to wait a little while." And on the design language across model lines, which enthusiast Cassandras have warned is too similar (as if that hasn't worked out for the Germans), he wrote that it is "undergoing gradual evolution and you will notice stunning new designs in future models, which remain unmistakably Cadillac and reflect our DNA but which take our sophisticated Art and Science design to a new level." But of course he would say that, which is what brings us back to patience and the future and eventually, when we'll see what this all really means. It all reads well enough, and we'd love to see it happen. One thing we won't see are the ducks that once adorned the Cadillac crest; when a reader asked if he could have them back, de Nysschen said, "No, you can't have them back. I play with them each night in my bath." Head over to Jalopnik for the full read. It's worth it.

Cars with the worst resale value after 5 years

While the old saying that cars lose a massive chunk of their value as soon as they’re driven off the dealerÂ’s lot might not be entirely true these days, most new vehicles steadily lose value as they age and are used. iSeeCars recently released its latest study on depreciation, finding the models that lose value the fastest, and the list is packed with high-end nameplates. The vehicles that lost value the fastest over five years include: Maserati Quattroporte: 64.5% depreciation BMW 7 Series: 61.8% Maserati Ghibli: 61.3% BMW 5 Series Hybrid: 58.8% Cadillac Escalade ESV: 58.5% BMW X5: 58.2% Infiniti QX80: 58.1% Maserati Levante: 57.8% Jaguar XF: 57.6% Audi A7: 57.2% While sports cars, hybrids, and trucks dominated the list of slowest-depreciating vehicles, luxury brands accounted for all of the top ten fastest-depreciating models. iSeeCars executive analyst Karl Brauer also pointed out EVsÂ’ lack of representation on the slow-depreciating vehicles list, saying that thereÂ’s a disconnect between what automakers are building and what people actually want. The average five-year depreciation for all vehicles in the iSeeCars study was 38.8 percent. ThatÂ’s an almost 11% improvement over 2019Â’s figures, but some vehicle types perform worse than others. EVs depreciated 49.1 percent over five years, while SUVs dropped 41.2%. Trucks only fell 34.8% and hybrids 37.4%. Brauer noted that all vehicles depreciate slower than they did five years ago. Even so, EVs are not the best choice if youÂ’re looking for a vehicle that wonÂ’t feel like a ripoff when itÂ’s time to trade in. On the flip side, used EVs can present a stellar value, saving thousands over their new counterparts. Charging times and availability remain concerns for buyers in large parts of the country, but a heavily depreciated EV could be the used car value youÂ’ve been looking for. The same wisdom applies to used luxury vehicles, as the list above indicates. While new-car buyers shopping for luxury cars are set to see big depreciation during their ownership, that means the used car market is flooded with inexpensive used luxury cars. High repair costs and costly maintenance schedules are real issues that used luxury models face, however. Green Audi BMW Cadillac Infiniti Jaguar Maserati Car Buying Used Car Buying