I just bought my 09 Sierra Z71 Crew two weeks ago with 86,000kms. I went into a the dealer for a oil change to find out that both my oil and transmission cooler lines are leaking at the crimps on the fittings. The surprising fact is that they aren't covered under powertrain warranty. Is my dealer full of shit or is this actually true. I have powertrain warranty until Sept 2014.
It doesn't appear like I am the only one to have these lines leak, but what are you guys doing to fix, just replace the lines with gm ones or get some new ones made up from a local hydraulic line manufacture? I know from my 98 Chev, there were aftermarket ones that were better in design and didn't leak near as often.