i always put 5 drops of ARO in the carb and 5 in the glow plug hole, i sometimes only go flying once a fortnight so i put a bit of ARO in there to keep everything lubricated (i run 10% nitro, so its best to be on the safe side and give it a little bit of corrosion prottection) but i dont put ARO in it if im planning to go flying again within the week)