1. Uses of lubricating oil: mainly for lubrication, auxiliary cooling, rust prevention, cleaning, sealing and buffering.

2, the use of butter: used as a food seasoning, mainly used as a seasoning, nutritious but high in fat, so don't eat too much.

3. Use of lithium-based grease: used for bearing lubrication of airplanes, automobiles, tanks, machine tools and various mechanical equipment.

Second, the overview of the three is different:

1. Overview of lubricating oil: Generally speaking, lubricating oil and grease are one kind of lubricants. The so-called lubricant simply means that between two relatively moving objects, it has the function of reducing the friction caused by contact between the two objects.

2. Overview of butter: Butter is a kind of solid oil processed from milk, which is the product of filtering out some water from the upper thick substance after fresh milk is stirred.

3. Overview of lithium-based grease: Lithium-based grease is made of natural fatty acid (stearic acid or 12- hydroxystearic acid) lithium soap, mineral lubricating oil with medium viscosity or synthetic lubricating oil, while synthetic lithium-based grease is made of synthetic fatty acid lithium soap and mineral lubricating oil with medium viscosity.

Third, the characteristics of the three are different:

1. Characteristics of lubricating oil: The color of oil can often reflect its refining degree and stability. For base oil, the higher the refining degree, the cleaner the removal of hydrocarbon oxides and sulfides and the lighter the color. However, even if the refining conditions are the same, the color and transparency of base oil produced by crude oil with different oil sources and bases may be different.

2, the characteristics of butter: butter is divided into edible butter and lubricating butter, lubricating butter, also known as grease, is a kind of lubricating oil. This paper focuses on edible butter: called "Xiri Taosu" in Mongolian, it has unique and pure flavor and rich nutrition, and is a good product for herders to entertain guests. Butter can be extracted from milk skin, white oil or concentrated oil skin of fresh milk.

3. Characteristics of lithium-based grease: Lithium-based grease, especially the grease thickened with 12- hydroxystearate, becomes a multi-effect and long-life general grease after adding antioxidants, rust inhibitors and extreme pressure agents, which can replace calcium-based anti-skid grease and sodium-based grease.

Baidu encyclopedia-lubricating oil (mechanical engineering terminology)

Baidu encyclopedia-butter (the product of milk processing)

Baidu encyclopedia-lithium grease