Which of the following are the most important additives used in lubricants? (Select all that apply.)

a. Corrosion inhibitors
b. Antifoams
c. Emulsifiers
d. Antioxidants


a. Correct. The most important additives are corrosion inhibitors and antioxidants. These additives provide protection to prolong the life of the equipment. Other additives that may be used include antifoaming agents, emulsifiers, antiwear components, viscosity range extending additives, and extreme pressure chemical components.
b. Incorrect. The most important additives are corrosion inhibitors and antioxidants. These additives provide protection to prolong the life of the equipment. Other additives that may be used include antifoaming agents, emulsifiers, antiwear components, viscosity range extending additives, and extreme pressure chemical components.
c. Incorrect. The most important additives are corrosion inhibitors and antioxidants. These additives provide protection to prolong the life of the equipment. Other additives that may be used include antifoaming agents, emulsifiers, antiwear components, viscosity range extending additives, and extreme pressure chemical components.
d. Correct. The most important additives are corrosion inhibitors and antioxidants. These additives provide protection to prolong the life of the equipment. Other additives that may be used include antifoaming agents, emulsifiers, antiwear components, viscosity range extending additives, and extreme pressure chemical components.

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