2001 GMC Yukon coolant loss

hello, my yukon blows antifreeze out of the relief from time to time. I keep adding to it but eventually it will relieve. I never see any leaks other than what comes out the relief. i have replaced the cap. The jiffy lube guy tells me it is normal to top off due to the antifreeze that gm uses??? I have heard the orange stuff is bad for the engine and to replace it with the green????