Got my new 2006, Z51 last night at 7pm. Sat on the side of the road with oil pouring out of for 3 1/2 hours waiting for roadside assitance, They never showed, so I gave up and got a ride hope. I now understand why GM promotes OnStar, GM cars are junk. The car is so reliable, it did not even get me home from the dealer. First GM car since 1981 and the last, I just hope I get my money back without a lawyer.