BMW 320i Workshop Manuals
If you wish to conduct auto repairs to your BMW 320i then it is usually recommended to possess a Workshop Manual to keep just for reference in case that you need to know the way to remove a specific part for example Brake Pads and install it again properly.
Searching for BMW 320i Manuals.....

BMW 320i Workshop Manuals can provide detailed diagnostic guidelines for the vehicle so if something is faulty it helps you figure out what the issue is and the way to resolve it. After that you can determine if this can be done yourself or if the job is too big you can make a booking for your 320i in with a decent friendly mechanic.