I think you need to investigate this claim. I know of at least one person who took his Z from the west coast to Branson and experienced 100% of his hoses sweating. He has all oil and power steering silicone hoses, revised type. I have seen other claims of sweating as well.
I went OEM for mine because of this. I would rather have the rubber turned porcelain hoses than ones that are slick and oily.