Some of you guys on here have stated that you are flying your quads over 100 times already. Question is, when is the best time to oil or grease these motors? Should you completely overhaul them with new bearings after a certain amount of flights? I am somewhat of a newbie and have had my Phantom since March... Studied the online manuals constantly before I took my first flight in June... I waited until weather conditions here were very favorable for me... Nice, Summer, clear sky's and no wind... I have flown about 15 - 8 minute average flights so far. One non-issue accident because I got a little sloppy trying to land around trees...But I'm getting the hang of it... So when is the best time to do my first maintenance on the motors, and is it a wise move to upgrade eventually to the Tiger Motor TM MN2214 920KV ... Everyone seems to like them... Any input would be appreciated... Thanks!