Unless you tun it somewhere very wet/dirty/dusty it'll quite possibly only need oiling something like once a year. If that.
I've only oiled one motor in the 5 years i've been back doing R/C. And that was after finishing a race in the pouring rain.
Usually the seals on the bearings should keep all of it out, as long as you keep on top of cleaning stuff off the motor shafts.
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