This is a big reason why a lot people don't want to own Bmw's any more after 50k. The reliability factor has been poor these last few years on some of their models. I'm not at all
surprised your having oil leaks at 50k, if you go to the X5 forums i'm sure you will see other issues common to X5s. If I was you I would dump that car or extend your warranty asap.

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2012, 650i Coupe, Carbon Black, Black Nappa leather, M Sport , CWP,DAP, IAS, 20" Wheels,
BMWCCA Member since 07/2008