I took the car into BMW the other day and they had a master tech have a quick look under the bonnet and he said to me, if there was not a bit of oil coming out from there he would be worried as this is normal,
Mine leaks at that place just a touch, not as much as yours. Its very minor and not worth worrying about, degrease it & it will look fine for quite a while. The black breather pipe that fits into the cover where the leak is, is held very loosely & oil is probably seeping out. The pipe can pull off with hardly any force at all and u will find its oily inside.
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