I got my rear diff oil changed a month and a half ago it was looking pretty rough wich surprised me since i only have 45000 k on it...now my pinion seal is leaking ford said it wasnt bad enough to fix yet so keep an eye on the level so i checked the level today it is good but the oil in the rear diff is grey again and its almost like its goopy and has lots of water in it....keep in mind that its minus 25 out right now...any ideas...could water be getting in through somewhere also could my breather tube be blocked therefore blowing the pinion??my main consern is how the oil looks im out in the bush right now and im worried about driving it back to town???and ideas?