Well, I noticed a downfall to a totally sealed gasket before last replacement it used some oil well several problems got those fixed and new valve cover gasket was using some oil went over to the Valvoline restore oil seemed to get better and gasket started to leak again was not using oil fixed valve cover gasket before I had to do 2 350 mile trips same week about 2 weeks after those trips I checked the oil was way low verry scarry low so with a totally sealed crank case it using oil again higher low preassure FYI