I have a 94 suburban and I noticed that it has antifreeze leaking down the back of the engine and there is a small pool sitting on top of the intake. I was thinking that this was a sign that the intake gasket needed to be replaced and I was preparing to have this done. However, when I check the oil there doesn't seem to be any antifreeze getting in my oil at all. Could this be something different? does the antifreeze ALWAYS mix with the oil when the intake gasket is leaking? thanks.