oil leak of any kind is not good. steer away. maybe car #3? dont talk yourself into buying it and regret later. get a car that has no known issues, less mileage even you have to pay a little more. you dont want to deal with problems on e53, they are just too much to deal with. trust me on this. good luck with whatever car you decide to buy.

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2002 X5 3.0 Siena Red
Premium, Cold Weather, Rear Climate Packages, 19" Wheels
Aluminum Running Boards, Clear Tail Lights, Clear Side Markers
Titanium Kidney Grills, Titanium Trunk Lid, Xenon Headlights
4.6is X5 exhausts, 35% Tint, Aluminum Pedals
2005 530I Mystic Blue
Premium Package, Sport Package, Xenon Headlights
18" Sport Wheels, 35% Tint all around
Mods to come: M-Tech Front Bumper, M5 Side Skirts, M5 Rear Bumper
Quad Exhausts, Style 172 19" Wheels