Carbon deposits on valves.. Check engine light came on. One cylinder lost some compression. The engine valves had to be cleaned and one spark plug replaced.
Engine overheating, fluid noted under front of car, water pump discovered to be nonfunctioning. Oil leak discovered and repaired Timing belt noted to be defective and was replaced
Water pump blew out while driving on expressway
Vehicle was overheating, discovered thermostat housing was broken allowing thermostat to flap around inside the housing and ruining the thermostat
Leaking (minor) seal/front engine cover. Repaired under warrantee. Just brought vehicle back same day picked up. Tech says leaking where shaft enters. The 3.6 uses a gasket and liquid sealent. Hopefully, this is where gasket is as that is easier to determine if fixed.
Minor oil leak from main seal.
Car sometimes will not start
Fuel pump module of engine computer failed.
Car would hesitate before downshifting when accelerator was pushed down sharply for passing.
Engine was overheating due to a leak in water pump
Engine light remained on. Contacted OnStar they advised me it was an emissions issue. Took it to the dealer. A part was replaced, and they also took care of a recall issue, that I was not aware of. Car was in the shop for a day.