Originally Posted by dirtysouthjacket
...and that the new one goes on correctly and is lubricated with oil.
At risk of putting words in his mouth, I think he was asking what happens if he doesn't use NEW oil like Flashdog suggested. The OLD oil works fine for lubing the O-ring. If the oil coming out of your engine isn't good enough to lube the O-ring, it should have been changed LONG ago.