"oil is generally the bearing lubricant of choice on those applications where higher speeds and operating temperatures are expected." " Heavier load and higher temp, higher oil viscosity" " If operating temperature is low or speed is high, low viscosity is needed." Need high quality non-oxidizing mineral oil or synthetic oil. Ceramic is heat resistant.
-Koyo Training Manual
Since this is small and fast go very light; perhaps lube from a skateboard shop. Use a light amount.
Yeah, rubber seals are slightly more resistant, but the metal shields get dirtier.
AE B4.1 Worlds, Losi XXX-T CR, Tamiya F104, Jammin x1x, HPI rs4 evo+