Sorry M5James, pardon the typo, I just have x5 on the brain right now. I had not heard of bleeding the cooling system. Ironically, when I bought the beast I drove non stop from LA to my home about 1300 miles. This leak was not there. But I took the car in to BMW for service and had them flush the cooling system. It was after that this leak appeared. Wouldn't they bleed the system when the do a coolant flush?

Now you have me wondering if there is too much pressure in the system and it has found a point of least resistance thus this teenie leak.