The large oil filter housing O-ring for the Citroen DS is designed to provide a perfect seal and prevent leaks. This essential component is made from high-quality, durable material that withstands oil and high temperatures. The precise fit ensures that no dirt can enter the oil filter housing, keeping the engine running smoothly. Without this O-ring, the efficiency of the oil filter can significantly decrease, potentially leading to engine problems. Therefore, always ensure the O-ring is in good condition and is replaced timely when necessary.