There are too many possibilities, you'll need to locate the source of the leak and make a determination why the leak is occurring. Water pumps, Radiators, coolant hoses, gaskets, power steering components, they all can leak.
i had the same problem with my 745. after paying 2000 dollars i found out it was the 0 rings on the cam sensor right next to the intake. i change the 0 rings and it stop leaking. there 4 of them. two in each side of the intake and they cost 4 dollars a piece so its the cheapest oil leak repair I've done and i did it my self so its really easy.