Hello; After an engine such as this is run, cooled, run and so on, does the performance of the engine change due to the expanding and contracting of the metal components of the engine? Just something I'm wondering about. That HydroDiesel was interesting, I figured the water would create steam making more thrust, I'm curious if that little water going with it makes just enough thrust to make it into a better fuel. What a marvel of engineering. I'm imagining the forces everything must be under and it's just mindblowing. And to think this is so tiny compared to one from a plane! Very nice. The reaction of the engine to the different fuels was fascinating. The amount of flames and smoke after throttling down especially. As a driver of ultra-low-sulfur diesel vehicles I know that they have extra lubrication additives to counter the lack of sulfur. Truly appreciated this video!