SA said the oil leak is from the intake manifold and will potentially cause malfunction of the 6 x swirl flaps. If these flaps are broken, it'll go into the cylinders and pistons and trigger bigger problem - ie. engine seizure.

I've googled this and found it is a common problem with the E60 530d. I guess this is more a diesel engine related issue.

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'07 X5 3.0d - Black Sapphire Metallic / Camel interior
Specs: Sport pack, Executive, 7 Seats, OEM 336, Hifi
Mods: Aero Kits, Titanium grilles, 4.8i exhaust, Tinted, ///M Footrest, OEM Sport pedals, OEM Rubber mats, OEM Sunshades, LCI Taillights