Just purchased a 07 yukon xl denali awd with 100k. I was told by my mechanic that the oil pan is seepin and leaking. He also told to have the dealer change it cause of labor. is this something that needs to be done asap I have been checking the oil level and has been ok so far, small drips in drive way. In NJ if anyone has a mechanic they trust to do this let me know.