JD 320 Skid Steer oil in coolant

At 1200RPM it pumps out about 4 OZ in 20 minutes.
Some times it sounds like it is misfiring a little. The exhaust is smooth and the manifold temps are fairly equal? Valve train or injector?
It has a faint sound kind of like bee bee's bouncing around in a can very rapidly. I have heard something similar with a turbo failure but it was louder. It seams exhaust related. Maybe a baffle in the muffler? I pulled the turbo as I feel impeller has excessive side play. The exhaust is not...

JD 320 Skid Steer oil in coolant

JD 320 Skid Steer oil in coolant