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Greases are semi-fluid lubricants made with base oils such as mineral, synthetic, vegetable, or a blend of mineral and synthetic. Soap (thickener) is then added. Lithium is by far the most common thickener because it is inexpensive. Others thickeners are sodium, aluminum, and calcium. Finally, additives are blended in to provide extreme pressure properties, corrosion protection, anti-oxidation, etc. Greases are generally used where a fluid lubricant is not practical. Roller bearings, …