BMW 135i Workshop Manuals
If you want to do fixes for your BMW 135i then it is usually a good plan to possess a Workshop Manual to keep just for a reference if perhaps you need to know how you can strip off a particular part for instance the Drive Shaft and match it again perfectly.
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BMW 135i Workshop Manuals gives you specified diagnostic guides with regards to your vehicle so if something is broken it will help you ascertain what the problem is and tips to repair it. After that you can evaluate if this can be done by yourself or if the job is too big you are able to make a booking for your 135i in to a decent garage.