If this had happened to me, I would have gone ballistic when they blew my engine. If I calmed down enough to hear their original plan I would have called BMWUSA that same day. If somehow I managed to get to where you are now and I saw my X5 sitting outside with a flat tire, regardless if it wasn't garage at home, if there is something beyond ballistic that would be me. If you can garage your X it would be on a flatbed today, headed to my house or immediately in a safe indoor place at the dealer, no exception. If you are not comfortable demanding what is only reasonable than call your attorney now and have him deal with the dealer and BMWUSA. This is absolutely ridiculous and shameful treatment of a customer. It is way past time that you give them an ultimatum, a drop dead date, after which you will file suit against the dealer and BMWUSA if you don't have your X back in a condition that meets you approval. In the meantime, you will be dealing with my attorney. I will no longer accept you lack of consideration and urgency. If you don't think or want your attorney to take it over you should still give them a drop dead date.

I'm not sure it/what they gave you to drive but if it is compromising to you I would immediately demand what you feel is acceptable to you. They can make a set up a new demo for you to drive easily enough.

I have dealt with product coming from overseas for many years and very seldom had significant delays due to customs.

I can't believe they don't have the capability to get the engine through customs in a timely fashion they must deal with customs on a daily basis.

If they can't change the oil without blowing your engine it is not likely they could figure out how to fit a 2014 5.0 but at least that could be shipped from the US plant. May not sound as good but that would be lots of goodies.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas