I've used blue devil. The $60 bottle is enough for 2 engines. Get the $30 bottle. It's the se thing, but less amount. It's NOT a permanent solution, but depending on the severity of the leak it can buy you some time.
My xterra overheated pretty bad and afterwards I had white smoke at startup and a little bit while driving. I threw BD in and the white smoke subsided for about 6 weeks. Now it's getting little wisps of white smoke every so often. Engine temp stays solid though, and no coolant in the oil or vice versa.
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