Bosch Diesel Fuel Filters feature a multilayered filter media that provides 99% efficiency in filtering out particles to better protect your vehicle's fuel system and engine from excessive wear while restoring performance High dirt holding capacity of 15 grams protects fuel systems and engines by trapping and holding more harmful particles - harmful particles that could cause excessive engine wear, damage to fuel injectors, and reduced efficiency Robust aluminum, plastic, or surface-treated steel filter housings are designed to withstand high pressure, harsh driving environments, and resist corrosion for longer fuel filter service life Bosch Diesel Fuel Filters are designed to be direct OE replacements, ensuring precision fit in the original location on your vehicle, with correctly sized input and output ports for simple, hassle-free installation Fuel filter replacement at manufacturer-specified intervals will maintain vehicle performance and prolong the life of the engine Compatible with select vehicles (Note: engine affects fitment - verify specific vehicle fitment details with fit checker above): MERCEDES-BENZ: 1976-82 240D, 1978-85 300CD, 1985,1987 300D, 1985 300SD, 1979-85 300TD