Bel ray gear saver 80w/85w/90w , Type F ATF tranny fluid, etc etc etc. Whatever gear oil you plan to run in your motor is what you will use.Not the premix oil!!!
Castrol GTX 20w-50 is where it's at black cap baby
But yea, soak them in FRESH engine oil. I normally let mine soak for like an hour (basically about 30 min fore i start pulling my engine down I throw them in oil) but over night will be great too