The answer depends a lot on you, and of course, we don't know that particular vehicle either.

Going from a scooby to an X5 is not moving in the direction of cheaper maintenance or less maintenance... The X5 is an awesome vehicle, but will require much attention if you DIY or $$$ if you are planning on paying someone.

There are lots of maintenance items to think about before and by 100k miles. Unless the vehicle has extensive records showing all the PM was done, I would suggest you enter the transaction only if you are willing and capable of doing a lot of work to it. EASILY plan to set aside $5k for first year maintenance/surprises, even if you plan to do mostly DIY. More if you plan on no DIY.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles