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My x1 35i is a 2015 thatbI bought CPO in 2017. Water pump/tstat and valve cover gasket are probably the main ones, and also the charge pipe tends to crack where it connects to the throttlebody. A lot of people (myself included) go with an aftermarket aluminum charge pipe to prevent this issue.
Some people have problems with leaky radiators, but I've yet to encounter that one yet (knock on wood...). I feel like mine has been pretty reliable, and I plan on keeping it as long as possible. So to be proactive I've changed fluid on my transmission, transfer case, and front & rear differentials. For reference, I just crossed the 70,000 mile threshold with my car.
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