How common is it for the oil pans on the 4.6L motors to develop a leak? I was checking under my car today because I've noticed that a few spots were starting to appear on the driveway. From what I can tell, there is a slow oil leak coming from the rear of the oil pan being that there is fresh oil on the rear of the pan and some is starting to splatter onto my transmission from driving. Also, it looks like the K-member needs to be dropped to get the oil pan out, is this correct?