If you're experiencing loss of power. Carbon cleaning you're engine will be beneficial as it will restore the lost power. This will help prevent engine component failure which can save you money. 

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Diesel Engines are more affected, as the fuel itself doesn’t burn as cleanly as petrol engines. The exhaust gases are often fed back into the combustion chamber to be burned again and this movement of sooty fumes is bound to result in a build-up of deposits over time.