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Every Smart filter has a specialised and important function in your vehicle. A pollen filter will ensure that your air conditioning system only allows clean, fresh air into the cabin while driving. Likewise, a Smart filter will ensure that only clean air enters your vehicle’s air/fuel intake. Regarding your Smart fuel filter, the function varies depending on your engine type diesel or petrol. For diesel engines, the filter avoids the entry of water into the engine, thus protecting the metal pieces from corrosion. In respect to petrol engines, the filter cleans petrol fuel of its impurities and contaminants in order to improve the combustion and protect the engine. At last, a Smart oil filter will clean the oil from any dirt or impurities so that these do not enter the engine. Replacement of all filters at regular intervals will ensure many miles of happy driving with few complications.