2006 Mini Cooper

Engine Mechanical problem
2006 Mini Cooper Four Wheel Drive Manual 47000k miles

as I was driving this mornig when I made a full turn the car made a funny noise, almost as if I stepped on to a rock and it came from the back wheel, when I looked there was oil spillage almost as if it had been sprinkled, can u tell me what causes it and if it forms part of maintanance.
July 13, 2009.

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