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Diesel by far. Fuel economy for one is not comparable. Maintenance should be less and better torque. That being said compare similar size engines. I have had two diesels 335d and 30d x5, never put a dime on power train except for noc sensor on 335d but it was covered under warranty. My 2011 335d had 200000km when sold and currently have 145000 on 2015 x5. Winter you ask. Well we live in Canada and the x5 starts in -35c temps.
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