Well, my now 2.5 year old 2012 Rubicon, finally threw the dreaded misfire code a few weeks ago @30,000 miles. I thought I might have dodged the bullet, but it wasn't meant to be. Sure enough, after a leak down test, two cylinders were leaking down to fast! Ended up with a new cylinder head on the left bank. Fortunately, I have a great dealership where I do business, and they fixed it right up, and all is right with the Rubicon.