Bro,
If the car is well taken care of by your friend, then he should be able to provide you the receipts or list of maintenance that he has done on the car. By asking those details, then you can prioritize what needs to be done first in terms of maintenance in order to bring the car up to speed (if the need arise). If your friend has already done those and car really has no issues, then you are one lucky guy!!
Good luck!