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not sure but Im sure someone will chime in here. My roommate doesn't have any damage to his cummins and the company claims it wont damage the metal/o-rings/tubes (in my faucet,dishwasher,spectic system,etc) in my bathroom but I haven't used it in my deuce or powerstroke.

X2 on running the hose w/gratuitous amounts of water I dont know how well it would work on a deuce but my roommate flushes out his cooling system by running some water/CLR mix for 10mins then drains, flushes again w/only water then refills w/coolant. The CLR really cleans out the...