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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.

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

Cadillac boss: Don't ask why we have so many sedans

Ugh, crossovers. Car-based, high-riding station wagons, for some reason, sell in absurd numbers and make automakers lots and lots of money. That's why automakers with a strong lineup of CUVs are running strong, while sedan-heavy brands are struggling. Cadillac is all too aware of this fact. While the company is preparing to launch the new CT6 luxury sedan, it's also realizing four sedans, a coupe, a crossover, and a $73,000, old-school, body-on-frame SUV does not a healthy lineup make. Worse, though, as Cadillac President Johan de Nysschen rued during the LA Auto Show, is that the new CT6 is joining a segment already oversaturated. While it's a big, expensive vehicle, it's not much bigger or more expensive than the CTS and XTS sedans. "Please don't ask me why we have three cars in the same segment," de Nysschen said, stopping midway through an interview with Automotive News on the CT6's market placement to make the crack. "That's a whole different subject." As for those CUVs, the new XT5 debuted in LA, and it will eventually be joined by another much-needed CUV in 2018, AN reports. Related Video: