I noticed the oil getting higher last ride and I just took it out for 30 minutes and it's even higher. In pretty sure it's antifreeze, any sure fire way to tell? I drained it into a glass jar and put it in the freezer. I know antiFREEZE is not going to freeze but thinking maybe the oil will sink and the ain't oftener will seperate and raise to the top. And this means it HAS to be the head gasket correct?