Menards: CO2, Foam, and dry-chem. I don't think I've seen a 20lb one though.

The trick would be to have enough CO2 to continue spraying until the engine has stopped turning so that it will not re-start, if it's truly a runaway even 5,000rpm will take a loooong time to spool down. I thought of using a halon extinguisher for the same reason, keep them in the car and garage, but enough halon to stop the engine will cost as much as a new engine!

I think it's pretty easy to verify that this is done correctly as Bill mentioned above.

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Gone to the dark side

- Jeff