Originally Posted by ComfyCar
Well I know why I been losing a little coolant lately.
Its getting out around the bolt. No big deal?
You're car is inducing it'* own weight reduction program!
On a serious note.. That looks like the paper gasket is leaking. If you haven't replaced the thermostat recently, I'd pick up a new one as long as you are there and ensure you get both gaskets, rubber and paper. The paper one seems to be your problem.
Tip for fixing that...use a small diameter tubing like vacuum or washer line and slide it into the radiator to siphon off about a 1/2 gallon... That'* enough to change the t stat w/o draiding the whole system.