is an important component of
engine oils and some industrial lubricants, such as
paper machine oils and
hydraulic fluids; helps control
deposits by preventing contaminants of combustion
from directly contacting metal surfaces and, in some cases, by
neutralizing acids. A detergent is usually a metallic (commonly barium,
calcium, or magnesium) compound, such as sulfonate, phosphonate,
thiophosphonate, phenate, or salicylate. Because of its metallic
composition, a detergent leaves a slight ash when the oil is burned. A
detergent is normally used in conjunction with a
dispersant.
Also see ash content,
engine deposits.