I had noticed about a month ago there was an oil leak on my truck, it was just a drop like everyone once in a while. Now it is leaking to the point where I have no oil in my truck in about 3-4 days. I put oil in it everyday, I have checked underneath the truck, but all the oil has blown back and I can't find out where it is leaking from. I'm supposed to be trading it, and the trade may not happen if I don't fix it. Any ideas?