I have a 96 12v cummins 4wd 5 speed. I bought the truck about a month ago and everything has been good, it had quite a few oil leaks from tappet cover, front seal, rear main and front case to block gasket, so i fixed all of them and put a hamilton cam in while i had the truck apart. Truck runs great until it started puking oil out of the blowby tube, the truck has 278k mile and was all stock until i got it, I drove it to dallas and back this past weekend (i live in san antonio) so about 600 miles round trip. My truck went through 6 GALLONS of oil to drive there and back. I have checked for vacuum leaks and have none. the truck idleing and warmed up has 0 blow by and sounds like a sewing machine, what else could be causing this? im at a loss