Any component will work correctly under oil as long as it doesn't have moving parts.
i.e a hard drive right? so like i said ssd it is! however they said the fans work just fine... they would act like a propeller to move oil around the cpu
did this some years back, and apart from the novelty, this whole thing is pointless, processor and an old Radeon had the mineral oil heating up rater hot... consider cycling the oil through a radiator but i had alot of trouble finding a pump strong enough to cycle something thick as mineral oil...