Severe oil leak

Seen them worst then dirt yard mechanic. Especially regarding troubleshooting.

 

Shouldn't be hard to find the source of the leak with how much you're going through. Gravity wins so most cases its from the highest point you see oil. Willing to bet your valve cover is loose or gasket is damaged.

 

Engine cover need to go off to check valve guide seals. The ####ty overhead what was done year ago can damage guides and it start leaking.
Go buy some brake cleaner wash out this mess and look where oil coming from. Engine must be cold for washing.

 

punks

 

If truck was in shop for low power, misfire, shaking the overhead check is first step to diagnose the root of the problem. There is Cummins procedures to run troubleshooting.

 

Cant see good from the pics but if its behind the thermostat housing good chance its a cam plate seal leaking. It fits with the recent work done as well.

 

Front cover and cam gear has to come off. If that is what it is