Does this system rust my car?
No. The water vapor is very hot inside the engine, and cleans but does
not cause rust to form due to the temperature being very high. Another
very important point is that there is enough lubrication in the
gasoline itself to prevent any corrosion of this nature. The water
vapor and hydrogen clean the carbon deposits off the pistons, valves,
rings, etc. This is why the engine starts to run smoother.