Your petrol can have a lot of contaminants, from sediment in the bottom of the tank to dirty service station nozzles, with your fuel filter having the responsibility of keeping all of that muck out of your engine. A new fuel filter is cheap insurance, especially for the expensive and highly tuned S54 motor. Replacing your old fuel filter will also help to maintain proper fuel line pressures, ensuring a smooth and reliable delivery when you need it. Manufactured by Germany's Mahle, a key filtration supplier to BMW.