Carbon deposits are extremely harmful to your engine. Carbon reduces the power and reduces the engine efficiency. This ultimately reduces your fuel economy, increases exhaust emissions, engine vibration, and the risk of premature engine wear. Over time, these deposits accumulate and form a layer covering the components in the combustion chamber, turbocharger, and exhaust system. Carbon deposition is extremely harmful to your engine, as it reduces the power and reduces the efficiency. This ultimately reduces your fuel economy, increases exhaust emissions, engine vibration, and the risk of premature engine wear.