NEVER EVER oil your drone motors ,when starting out several years ago (THE OG MAVIC 1) I added one drop of 3 in 1 oil to each motor ,it flew ok for about a year ,but on a RTH I noticed smoke coming from one of the motors ,took it home put the...
The plugs should be re-gapped every 50 flights or you start to lose power, and the valves should be adjusted on a similar schedule or they get noisy.
Also top off all the fluids before every flight.
Be careful! While doing a tune-up, I was messing around with one of my Drones and the Magic smoke came out, I have been all over the net and can't find the stuff anywhere!