Oil filter protects the surface of an engine subjected to extremes where during normal opration lubrication oil forms a thin film on the friction surface so that metal contract is virtually eliminated. The friction surface are protected from wear only by this film of oil. This means that any abrasive particles thicker than the oil film can cause harmful wear & tear to the internal component the engine which can be thus damaged are expensive items such as crank shaft & main bearings. Therefore, clean oil is prime importance of the life of engine.