Show oil filter must have its regular servicing three years ago before adoption of the oil filter car manufacturers recommended om mended that oil in the crankcase be every miles today these manufacturers oil changing range from 1 to 3 miles th average recommendation Is every 2 miles this longer use of the oil has been made possible because of adoption of the oil filter which filters the oil removing from it foreign matter that otherwise would cause wear to the engine s vital parts the manufacturers oil changing are based on the use of nn oil filter and it Is further recommended that the filtering unit be renewed every miles in order to insure its at highest ef fi clency the filter it Is explained besides removing the ab rashes aiom the oil before they can damage cylinders pistons and intern il parts ef the engine also a saving in oil of about 29 per car per year |