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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.

GM extending warranties on Cadillac CTS-V and Chevy Camaro ZL1 for supercharger issue

Okay General Motors, we've sat by and watched you recall the compact cars, crossovers and pickup trucks, and aside from reporting on it, we've been fairly quiet. This, though, this will not do. We can almost tolerate the recalls on the bread-and-butter cars, but leave the performance vehicles alone.
According to a report from The Car Connection, GM has discovered a problem with the superchargers of the 6.2-liter V8s found in the Chevrolet Camaro ZL1 and the Cadillac CTS-V. Apparently, the issue rests around the internal bearing shaft grease, which can become contaminated (we aren't sure with what). If left unchecked, it'll first lead to a rattle at idle, which goes away under slight throttle. The real warning stage is when a high-pitched squeal develops, signaling that the bearing shaft has failed. Naturally, severe engine damage is the next step (although it's possible that the engine will also just refuse to turnover, although neither case is desirable).
According to TCC, GM will replace the superchargers on vehicles that have exhibited symptoms of bearing shaft failure free of charge. It will also, allegedly, be extending the warranty on all supercharged ZL1s and CTS-Vs to 10 years or 120,000 miles (whichever comes first), from the date of purchase. Officially, only 2009 to 2013 CTS-Vs and 2012 to 2013 ZL1s are suffering from this issue.

2014 Cadillac ELR leases for $699 a month

Most Autoblog readers thought the $75,000 price tag on the 2014 Cadillac ELR was too high. If you can't swing the MSRP all in one go, how does a lease price of $699 a month sound? That's the amount that Cadillac is offering on the official ELR website, with some caveats, of course. First off, it appears that this lease price is for just for "current owners and lessees of all 1999 or newer GM vehicles." They will also have to pony up $4,999 at signing (all others will need $5,999). Second, the $699-a-month price is for a 39-month lease. Then, of course, "tax, title, license, dealer fees and optional equipment [are] extra" and "each dealer sets own price." Also, it appears that this lease deal is only good until the end of January. Cadillac started shipping the ELR plug-in hybrid coupe to dealers last month. There are two things to note in the fine print. The most surprising is that the payments are based on "a 2014 Cadillac ELR with an MSRP of $76,000." That's $1,000 more than the official MSRP announced in October. Then we get to the real kicker: The lease limits you to a mere 32,500 miles, which is just 833.3 miles a month. Well, 'limit' isn't the exact word, since you can certainly drive more. All you have to do is pay 25 cents per mile for each mile over 32,500. Drive the national average of 13,476 miles in a year? That comes to 43,797 miles over 39 months, which is 11,297 extra miles and an extra $2,824.25.