Dave is correct. There is way too much fuel going into this motor. There is no way the motor is burning what you are putting thru it. This is going to cause issues in the cylinders and start filing the pan with alky. I am curious what comes out when you drain the oil. You need to be able to hit the water at 160-170 degrees and gain about 10 degrees going down track, no more than the 15 Dave mentioned by the time you hit the trailer.