I have a 2011 LS with 70k. Recently I noticed a drop of oil under the drivers side. It looks like oil/coolant is leaking from above the driver side motor mount where it meets the header heat shield. The oil can be wiped away and then engine stared, idled and the drip won't immediately appear. It seems to only drip once or twice after the engine is turned off. There's no oil anywhere else in the engine bay. Before I start taking it apart, I hoped someone had ideas or experience with this issue. Any guidance helps.