BMW 650i Workshop Manuals
If you need to conduct maintenance on your own BMW 650i then it is always recommended to have access to a Workshop Manual to keep just for reference in case you need to know how to strip off a specific part for example Exhaust and install it again safely.
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BMW 650i Workshop Manuals can provide certain diagnostic information for your vehicle so if something is playing up it will help you ascertain what the problem is and tips to resolve it. You can then analyse if this can be done on your own or if the job is just too big you could make a reservation for your 650i in with a nearby car garage.