The new and nasty deicing crap they use on the roads is horrible on brake and fuel lines....and the entire underneath of all vehicles. Brake lines show up first, then fuel lines, then exhaust system......meanwhile the doors fall off ....the suspension mounts, subframes, etc. If you are purchasing a used car that has been 'living in the northern tier', use caution!!!!
If you are foolish enough to think they can last 10 years, you are going to be disappointed. Keep them clean....get to know 'fluid film' and keep a can around for hinges and any parts you want to last.
This is not a GM issue more than any other. Any Dodge owner knows that you can go visit a dealership and sit quietly in the parking lot and HEAR the SOB's rusting right in from of you!
Ford has the same issue.....Hyundai, Kia, Mazda, Mitsubishi, Jeep...ALL of them. Yes, VW, Audi, Mercer...too!