i just got my 06 grand prix gt about a month ago it has 68,000 miles on it i bought it from a auction so i dont know the previous owner and im not sure if the car was well maintaned but i want to make sure everything is good in it. i just bought some gm supercharger oil and some mobil 1 synthitic engine oil and im planing on changing them this weekend but is there anything else i should check for that might need to be changed or looked at ???