intake gasket is sweating coolant?

For the hell of it I left the radiator cap loose and will observe it over the next day, the radiator is full as i have a overflow tank but im wondering if just a fluctuation in the ambient temp is causing the coolant to expand and push out of the gaskets, i dont think that will make a difference since i would think there is more pressure on the system while its running but im just curious.

Can pull your oil plug real quick and put it right back in, catch in an oil drain pan. If there is any anit-freeze in the oil at all it will be at the very bottom of the oil pan and come out first. You may even see anti-freeze coming out around the drain plug threads as you are taking the plug outs.