When I had boats, the marina used it to winterize boats. I've seen them start a old chevy v-8 that was sitting outside for at least 10 years, and it started surprising easy, and only smoked for about a minute, then stopped smoking altogether. So I would say it does work for long term storage. The reasoning behind how it works is, when spryed into the intake manifold, it burns and tends to cling to internal parts. I would say it does that alot better then just spraying WD 40 in there. That stuff will evaporate in a little while, leaving no protection behind.,,,