I have an 06 GM ecotec engine that was leaking oil from the valve cover on the forward side of the engine. The engine became covered in a dirty oily mess but it never dripped onto the ground so I didn't repair it for years. Finally sealed in up and the oil consumption dropped by about .2QT a month or .2QTs per 1,400 miles. I find it hard to believe all this oil was just evaporating. Is this possible?