I just spoke to a customer service rep. About my truck W/120000mi. The dealer told me I have a cracked piston ring. GM says it can do nothing to assist me me in repairing this problem, because of high milage. I been told it will cost around 4 grand to fix. The truck is blowing white/blue smoke. Anyone know of any other options. I don't have the money right now to fix. I used to like this truck alot, but now I am wondering what I got my self in to. The truck has become one big pile of chit, that I'm still paying for. This SUCKS!