Need new valve cover gasket on that side! Check the other side will be hard with the air box in the way. Had same problem with mine changed the gasket now it doesn't leak at all. Also WTF is up with your bubbling paint by fill cap you running hot?
Cost to replace gasket at BMW was $962.31 covered under warranty that included a engine bay wash as my fill cap gave out making a mess everywhere!( lost a liter on way home from beach
) Hope this helps good luck!
This was mine @ 42k miles