Well I found another leak today that I don't know the cause of. Today when I was finished undercoating the truck I went to start it and it cranked for a few seconds and finally started but immediately died. I tried it again and it cranked for about 3 seconds then it fired right up. After I put it in the garage for about an hour I could smell the unmistakable smell of diesel fuel and being that I had the only diesel vehicle in the garage I knew exactly what vehicle the smell was coming from. So I took my creeper and rolled under it for a few minutes and no luck so I popped open the hood and after some searching I found this leak pictured below. Does anyone have any ideas about what could be leaking? I am not sure but I think its oil because it is located right below the oil filter housing. I am in the process of finding a scanner/monitor so I don't have one right now so I cannot get any codes or anything. I kind of asked a bunch of questions at once but any help would be great.