I didn't use the seals on this engine because they make getting the valve covers off a real pain. I have a FTS cam, so they need to come off regularly. I do get a bit of oil at the bottom of some of the plugs. But I just sop it out with paper towels once in a while. Half a tube of oil is a problem that paper towels won't stay on top of, but the root cause should be large enough to identify.