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Shouty Kilmore has several videos promoting stop leak products. Eric the Car Guy has one showing what happened when a customer tried it. It still needed a head gasket replacement, but now it needed the rest of the system replaced.
Some people swear by them, or insist one is good, but the rest are bad, but regardless of how closely you follow the directions, if it does not work, they insist you did not follow the directions.
I replaced the head gasket on my Forester. It was a pain, but I knew it would work right afterward. It cost me $500 in parts and tools.
There is much more evidence that it will do damage than there is that it will help.
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