BMW 520d Workshop Manuals
If you need to perform maintenance tasks on your own BMW 520d then it is usually recommended to have a Workshop Manual to keep just for personal reference just in case you need to know tips on how to take off a particular part for example Drive Shaft and install it again the right way.
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BMW 520d Workshop Manuals provide you with distinct diagnostic info for your car therefore if something is playing up it can help you find out what the issue is and the best way to fix it. You will be able to analyse if you can do this on your own or in the event the job is simply too big you can make a booking for your 520d into a decent repair garage.