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Behold, 8 gallons of filthy coolant drained from the radiator during one flush.For all those thinking of using Stop Leak or some other similar substance to fix a radiator that is leaking at the plastic end caps... Don't. Either replace the radiator or remove it and take it to a radiator repair shop. I finally replaced mine with a Nismo one. Before adding the stop leak, I had a small greenish/whitish puddle that would occur. Shortly after using it, I still had the puddle but had replaced the lovely green hue with a rusty brown one! When I eventually removed the radiator, I discovered it was so clogged with the Stop Leak sludge that when the drain plug was removed absolutely nothing came out of it! Not even probing with a coat hanger could cut through the gunk. I suspect the entire lower half of my radiator was filled up, and found it amazing that I never had any overheating problems with it. After two flushes the coolant still has a slight brownish hue to it from the residue left in the hoses and engine. I doubt it will ever be completely clear again. Just thought I'd share.
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Reason Number 103 not to use Stop Leak in your radiator. - 
