I have a 96 6.5 turbo diesel and just above to motor oil cooler it looks to be brass fitting just above oil cooler line and is leaking oil .dosent look like freeze plug to small maybe 1/4 by 1/

 

Hi Big Mikey welcome to Diesel Bombers. I think what your seeing is a leak from the oil cooler portion of the radiator? Here is some info on the cooler lines and the radiator itself.
Does the plug look like it has a snap ring in it? or is just a solid brass plug?
here some info.
oil-cooler-line-replacement.pdf

 

its not the oil connection . Its a small brass plug sticking out about 3/8 and a open hole.Its the same side as the oil cooler connection and really close to the connection