Grease is a consistent lubricant which is made from mineral oil and/or synthetic oil as well as a thickener.
The advantage of grease is its high consistency. Greases enable lubrication to stay where it is needed. It can be used to seal bearings and protect them from intruding dirt and prevent corrosion. Grease consists from mineral or synthetic oil, additives and thickeners like lithium, natrium and calcium soaps. The base oil and thickener decide the properties of the grease. The amount of the thickener and its chemical composition define the consistency (NLGI grade). These NLGI grades start at 000 (fluid) until 6 (very hard).