Grease is a semi-solid lubricant that consists of a mixture of a liquid lubricant and a thickener. The lubricant acts as a lubricant, while the thickener maintains the lubricant and provides resistance to flow. The consistency of grease can be cut with a knife or flow at low pressure. Similar to oil lubricants, additives are added to greases to improve load carrying capacity, oxidation resistance, and corrosion control.