Are you sure its motor oil! My 04. 5 has 122,000 miles on it. At around 60,000 I started to notice a drip. I thought no big deal its a diesel but, after my customers had asked that I do not park in the drive way I cleaned the engine and kept it clean to find where the oil was coming from the stock catch bottle in the valve cover was clean and the top end of the tube was dry. so why is the bottom oilly? To make my long story shorter. It was coming from a small high pressure fuel leak that just seaped fuel and ran down the out side of the breather tube.