A friend told me that as carbon builds up inside a car's engine, performance of that car decreases. And if there is too much carbon dioxide... it can really screw up the engine so bad that the engine will have to be replaced... He says... that it is possible to remove the carbon from the engine... if while ur driving... u rev as much as you can. Apparently you will be able to see thick black clouds of carbon coming out of the exhaust as carbon is removed...
What I want to know is... is it true, and does it really work? Is it bad for the car... Can anyone comment on this or make any suggestions... should I try it or not?