Wife has had one for a few years. Just passed 100K and although it has never actually broken down it has it's nagging problems. Window regulators. Cutting a coolant hose(why does it have two hoses running to the same place?). V8 leaks.

Assuming going to an E70 with a 6-banger or diesel how is it? Generally reliable? Windows are more reliable? haha

Would be a CPO more than likely.

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2009 E70 X5 - Third Row - Rear DVD
Past - 04 4.4i Sport Package