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It's hard to prevent most of the major issues. The serpentine belt problems are usually due to the tensioner or pulleys wearing out. Other times its due to the oil leaking from the valve cover.
A lot of times people go overboard but changing the fluids is the most important. Transmission fluid + filter, both differential fluids, transfer case fluids. I'd also change the coolant to the BMW HT-12 with a 60/40 mix and not the 50/50 mix the dealers and most shops do.
The almost guaranteed failure items, not included in preventive maintaince, before 125k miles are the water pump, OFHG, OPG, Valve Cover Gasket (BMW advises to replace the valve cover too due to warping), VANOS solenoids, belt and assembly, engine mounts.
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