I've been told by 2 different dealers that my 2015 Yukon lines are leaking. They look just like the pictures you have, residue on the line but no drops on the garage floor. I've got 106k miles on mine, but I'm trying to avoid worrying about it until the leak is more significant (actually produces drops or is affecting fluid levels).
I've currently got my 2015 Yukon XL (106k miles) in the shop to have the AC repaired...a different story... and the shop gave me the usual run down of issues that need to be addressed. 2 items that they mentioned where the transmission cooler lines and engine oil cooler lines were both leaking. They are not the first shop to tell me that these are both leaking (and make it sound like there is an immediate need for replacement). I recently replaced transmission fluid on this vehicle and inspected the lines myself and I agree that the oil cooler lines have residue around the couplers, I think leaking is a strong word for my what I am seeing. I don't agree that the transmission lines have any issues. My questions for everyone, is it really that uncommon to have some residue around couplers for these lines? When I haven't seen any evidence of oil/fluid on my garage floor and neither fluid is unexpectedly dropping, any reason you'd rush out to replace these? I certainly feel like a little residue on these lines is the reality of running a complex machine and until it is noticeably losing fluid, replacing them would be a waste of money. Thank you for any input!
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