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I had this on my 635. If you look at the drivers side of the engine at the back of the air box you will see the turbo oil return pipe. They often leak from there. Also the turbo boost pipe seals perish and you can get a lot of oil from there. Another really common issue as well is the swirls flaps. The seals are poor and you get a lot of oily residue leaking down the side of the engine. Mine unfortunately had all three issues. The biggest oil leak was the swirl flaps and the entire passenger side of the engine was wet. I removed the inlet manifold and removed the swirl flaps and this cured the problem. How many miles has your car done?
Cheers
Jim
 

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You can't replace the swirl flaps so I removed them with blanking plates. Made absolutely no difference to performance and stopped the leak from the inlet manifold and also does away with the worry of a swirl flaps failing.
Cheers
Jim
 
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