I am still debating on whcih oil I should use on my X5..

1. Mobil 1 5w30
2. Mobil 1 0w40
3. BMW Oil 5w30... Lazy to go dealer. or
4. Castrol Synthetic 5w30 the ones at Walmart..

I have used the Mobil 1 5w30 on my X5 and I am not sure was that the cuase of my pan gasket leak. Does the leak have anything to do with the leak?? I had the gasket replaced by the dealer under warranty. Well I want to know what kind of oil you guys use for oil change on the X5.. Thanks everyone.