15% of the weight of Oil filled powder metal bushings is the oil that has been impregnated by using hot oil and a vacuum system under pressure. The air is sucked out of the powder metal bushing pores creating a void that is then filled with oil. Over time oil leaves the bushing. Oil comes out by centrifugal force, heat and leaching out if improperly stored.Below is a list of Oil Filled Bushings design features and characteristics. These are not the only design features available for Oil Filled Bushings but this is what we would have available from our inventory in Florida. Click on any of the links below and you will see a list of products available off of our shelf today with that particular feature. If you do not see something please INQUIRE AVAILABILITY here.