Well usually form Memory a 0470 or IO-520 Engine run on 9s. So if it has 9s in it leave, otherwise what you put in will be lost out the breather. If its a long flight, the same, put in on 9s and leave it, adding 12 will just dump 3 quarts for no reason. And if your a Charter Pilot and you continue using all that oil either your Engineer or your boss may become very interested in what your up to.ie. wheres all that oil going?
Sheep
