Went to get oil changed and mechanic told me that the threads were coming apart when he was unscrewing oil drain plug. He screwed it back in and told me I was going to need a new oil pan. Im not sure what it would run or if I can find it used. Does it have to come off a 2010 aveo or does another gm car have the same oil pan. How hard would it be if I did it myself once I have the part? Any input would be appreciated. Thanks...