I was told by the late, great, George Aldrich to use a 50/50 mix. I did use 100% until I tried it diluted...diluted works better. Either way I still have to do final cleaning with a toothbrush/lacquer thinner when cooking is done. I don't like to cook a piston/sleeve assembly because it can/will remove any built up coating of castor that improves the seal/compression. This is VERY important if you cook an older engine (non-ringed pre ABC). I guess if you use an all synthetic fuel, go ahead. If you are cooking a ringed engine, fine, cook the piston/sleeve, too.

I don't cook o-rings, gaskets or any plastic parts. I like to tear the engine down as far as I can...including the carb.

Last, but not least, DO NOT EVER use the crockpot to cook food again after using it to cook your engines with antifreeze.