81 240D Coolant leak/ After coolant change

[coolerelmo]

Back at fixing my 81 240D again. My brother went and got a radiator flash last week. I drove about 30 miles a couple of days after. While the car was sitting overnight I went to drive and found a small amount of coolant on the ground. I checked the overflow tube and it was dry. I started it up and found coolant leaking off the oil pan.

It appears to be coming from somewhere near where all the belts are and is leaking onto the oil pan.

Any ideas?