OIL AND LUBRICANTS.

The primary purpose of a lubricant is to reduce friction and wear between two moving surfaces,but a lubricant also acts as a coolant,prevents corrosion,and seals out dirt and other contaminants.In order for a lubricant to perform as intended,careful attention must be given to its selection and application as well as its condition while in use.
OIL LUBRICATION
Oil lubrication can take many forms- from a simple squirt oil can to a complex circulating system.Regardless of the method by which the oil is applied,the intent is the same,which is to keep a lubricant film between moving surfaces.
GREASE LUBRICATION
Grease is a lubricant consisting of a lubricating oil combined with a thickening agent.The base oil makes up 85-95 percent of the grease and performs the actual lubrication.
HYDRAULIC OIL.
The main purpose of a hydraulic oil is to transmit power,but it also must lubricate the components of the hydraulic system.In many systems,a lubrication oil such as turbine oil can be used as the hydraulic fluid.If the system uses a gear pump,operates at pressures less than 1000psi and has similar viscosity requirements,a turbine oil can function very well as hydraulic oil.