2015 Freightliner Cascadia 113. I had a Spider/ crank case leak and had it replaced on the road. My driver drove another 767 miles and the oil pressure started dropping and losing oil again. The dip stick had large amounts of oil coming from it. Truck cut off as she was pulling into the mechanic shop. What could it be? I was told maybe a piston or cylinder. I'm not familiar with the DD13 motor. Any feedback would help.