The oil-water separator for automobiles is a kind of fuel filter. The principle is mainly based on the density difference between water and fuel oil, using the principle of gravity sedimentation to remove impurities and water separators, and there are also separation elements such as diffusion cones and filters inside. The oil-water separator also has other functions, such as pre-heating the fuel to prevent wax formation, filtering impurities and so on.

Water filter (English name WATER FILTER) plays an increasingly important role in the engine.
The water filter filters the impurities in the coolant, prevents the formation of scale, and ensures the normal operation of the engine cooling system. The water filter can filter impurities in the water, and protect the cylinder liner of the engine through high-quality filter media to prevent scale, stress corrosion, etc., thereby prolonging the service life of the engine and reducing maintenance costs.