My new Chevy Hd has an Oil leak at 2500mi. Dealer advised they have had several 6.0 liter's with leaks in the casting of the oil pan? Its leaking a very small amount at the back of the pan where it meets the bell housing. They say the trans will have to come out to verify if its the pan or main seal? Have any of you had this issue? Not to stoked on having the trans dropped on a brand new truck?