A little off topic - I've read a number of times about people trickling distilled water into a running engine to "steam clean" the carbon out. I've always been too chicken to try it, as water does not compress - no how, no way. Imagine figuring out a plausible story if it went wrong...
"Geez - Why did the con rods blow right down through the oil pan, with the car sitting in the driveway"
"I - er - uh - it - um, I dunno!"
