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Be careful about using too much stop leak, it can clog up your cars heater and even effect the radiators cooling capacity (a hard lesson learned). I have had good luck with it though, I even used it to temporarily (for 60,000 miles) fix a cracked head (the exhaust valve seat to spark plug hole crack I mentioned earlier). However, when I finally had to replace the spark plugs the crack opened up again and I couldn't get it to stop leaking after that.
Steve
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