General FYI & Warning.. 3.6L & 2.4L engines
At the shop where I work, we are seeing a run of 3.6L GDI engines (mainly in the Traverse, but I know it's used in other models as well), that are stretching the timing chains to the point of driveability issues, and in more than one case, complete catastrophic failure.
Enter the Claim Adjuster from a third party warranty company, and the Jasper Engine rep..
What the adjuster is telling us, is that not only are the chains stretching, but there's also been accelerated wear on the guides & tensioners as well. The Jasper rep confirmed this. Both of them also told me the 2.4 engine is becoming notorious for breaking the top timing chain guide inside the valve cover, which then allows the chain to slop around and wear on other components, until the chain outright fails (I wonder where I've heard THAT before?).
Both of them said the failures are beginning to happen at right around 85,000 miles.
So my advice would be, if you have a 2.4, pull the valve cover and inspect this particular chain guide.. If I had only known of this six months ago...
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2011 LS, 2.4L, six-speed ATX