A: the role of the car engine oil is mainly maximum reduce the friction mechanical components, reduce the energy loss and parts wear and tear. Oil filter can remove the dust and metal particles in the oil, carbon deposit and soot particles, such as groceries, protect the engine. High quality oil

Filter filter to filter impurities under severe temperature changes, so as to better protect the engine, to ensure the normal use of the vehicle life. Cars and commercial vehicles, as a general rule, be replaced once half a year.