Hi guys,
I have a 2000 Jeep Cherokee sport with about 138,000 miles on it. I recently changed the oil like I have in the past, using the Royal Purple and a Wix filter like I always have. For some reason I have sprung a leak shortly after. I thought initially it may have been the filter, or the oil pressure sending unit, but those are dry. The oil is running down the plate behind the oil pan, by the drain plug it appears. Would this be the oil pan gasket/rear main seal? I have also checked the valve cover and gaskets, and I replaced those in March, and they seem to be in good shape. Thanks again, and here is a crappy picture of what I am looking at!

 

Check and see that your valve cover bolts haven't backed off, especially the rearmost ones.