Plate-type oil feeders are suitable for the dry oil centralized lubrication system of small machinery and equipment. When used in conjunction with a single-line dry oil pump or a multi-point dry oil pump, they form a single-line centralized lubrication system that can automatically supply grease to approximately 100 lubrication points at timed and measured intervals. Each feeder is equipped with an indicator device for timely checking of the oil supply status.