
My hoses have not become stiffer. I've used Mayhems with no lye tubes. Not sure about other reviews but ok. I ran 16 hours. Drained and filled with coolant, no problem. I didn't wash it off because I was tired and read there was no need to wash it off. it was cleaned because there were some particles in it. I washed it 5 times with warm distillation and found more of this junk.

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