What is a Grease?
Unlike piston engine oils (PEOs) and turbine engine oils (TEOs), greases tend to be thicker, taking on a solid or semi-solid form. They are a thickened lubricant oil, with the main benefit being that they remain in place, available for use at the most critical parts of a mechanical operation. Because of this thickener, a grease acts like a sponge, releasing lubricant when necessary and then reabsorbing it once the pressure has been relieved. While greases benefit from having less flow, this does mean that they are ineffective at removing heat and other contaminants from the process.