I have now hit close to 3,000 miles on my Titan. One oil change, second chain, second tire, umm..... That has been about it. Since this is still my original Titan, I have been abusing it terribly, I feel bad about that sometimes, but it is my test Bed engine. So far, it has not missed a beat !!! The compression is better than new, it can still yank your arm off if you do not set up the pull properly. When you set up the pull correctly, it is a smooth easy one pull and go. But again.. Only 3000 miles.. Not even break in yet... lol.. I am up to around 135mpg WOT and I can cruise 33mph at 9000 feet. No kidding.. Enjoy the ride..