My 03 Cobra sprang an oil leak after changing the oil . had about 700 miles on the oil when this happened. I changed to Amsoil full synthetic. Anyway, it seems to be leaking between the adapter and the cooler. I'm wondering if the stud may have loosened a little when I had the oil changed ??? The gu u said the filter was on really tight when he changes it. What size is the Allen head on the stud?? Figured I'd pull the oil filter and check it before going thru and having the cooler redone. Car has 14700 miles on her.