Okay so bunches of anecdotal data, nothing concrete with pictures.
I ask this because once I ran this stuff constantly for a 100K miles in the 318 powered surfer van I had and on teardown for rebuild found no damage or restrictions or residues in the coolant passages after a garden hose flush through the heater line. Had the radiator recored with a 4 row, the rebuilder found the rock damage by the pooling of stop leak.
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