Not the valve cover screws. Pull the dip stick and see if you have water in the oil(it looks like baby poop). You might have a bad head gasket(that is an easy fix) If it is not water in the oil, then you might have a cracked head(not so easy to fix) or, you just need to warm it up to dry the moisture out of the oil(has it been sitting that 4 years with out a good run? So check the oil in the pan first. Good oil in the pan is a good thing.
