All I own is an Intek (Craftsman dyt 4000)so a low sample size, but one I know well. Since 2009 (new) I have been into to valve area many ties. When checking valves I have never seen more than 2-3 tablespoons of oil drain off into a catch can. It appears the oil to the head and valve stems is a fog of oil droplets, enough to lubricate the valve stem , but offering very little cooling. I won't speak (again) about the cooling defieciency of this arrangement.