We bought a new 14' and the only thing was A/C around 45,000. They put dye in the line, recharged the system, no leaks. Went back one week later and 2 weeks later and no leaks. A/C has been fine through 2 seasons. Cost was $144.00. Oil changes and other filters are done at the dealer at normal intervals. I have a very trusting service department at our local dealer ship.
My comment might be, to buy a used GM car from a GM dealership. Long story short. IMO. Good Luck.
14', FWD, SLT-1, Navigation, Ziebart Rust Protected & Undercoated - 19" Michelin Defender LTX M/S - Silver Club #7, SLT-1 Club #37. 56,000 mi - Top Tier Gasoline, Techron, Synthetic Oil