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engine oil

lubricant

Also known as: motor oil

Learn about this topic in these articles:

use in internal-combustion engines

In gasoline engine: Lubrication system
…for each engine, and the oil must be suitable for the severity of the operating conditions. Oils are improved with additives that reduce oxidation, inhibit corrosion, and act as detergents to disperse deposit-forming gums and solid contaminants. Motor oils also include an antifoaming agent. Various systems of numbers are used…
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