Originally Posted by andregayola
like burns clean off
Cleans out the lines, injectors, cylinders. Any carbon deposit that it contacts with. In the oil it will clean out all the sludge that goes through your engine, so when you run it through the oil when you change it the oil will be pretty much black if there is a lot of gunk in there. Don't use it too often, it's something that only should be used every once and a while. On well maintained engines it pretty much doesn't even need to be used.