VT365 OIL LEAK & DIAGNOSING LONG CRANK / NO START

IN THE FIRST VIDEO ABOUT THIS TRUCK, WE WERE ABLE TO GET IT STARTED. I QUICKLY NOTICED IT LEAKING A LARGE AMOUNT OF OIL. I ORDERED THE SEALS THAT I THOUGHT I NEEDED. I WANT TO GET THIS LEAK FIXED SO I CAN RUN THE ENGINE FOR AN EXTENDED PERIOD OF TIME IN ORDER TO GET A GOOD ACCESSMENT OF ITS CONDITION....AND IT SHOWS IT HAS A PROBLEM...