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actually people (including myself) have stopped minor coolant leaks with pepper

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I have stopped minor coolant leaks with pepper also. I used "coarse ground pepper" as the regular seems to be too fine. Leak was stopped for as long as I needed.

Pepper doesn't seem to have any adverse effects on the cooling system like other sealers do.

If it's already knocking on cold start up the motor isn't in the best of shape anyway.