First of all, we need to know, what Motor Oil is. Motor oil is a lubricant used in internal combustion engines, which power vehicles with the engine, and many other machines. The second question comes to our mind is, why we need motor oil? In the following lines, we try to give you the answer in a brief. In engines, there are parts which move against each other, and the friction wastes otherwise useful power by converting the kinetic energy to heat.
It also wears away those parts, which could lead to lower efficiency and degradation of the engine. The main reason behind using lubricating oil, it creates a separating film between surfaces of adjacent moving parts to minimize direct contact between them, decreasing heat caused by friction and reducing wear, thus protecting the engine.
Coating metal parts with oil also keep them from being exposed to oxygen, inhibiting oxidation at elevated operating temperature preventing rust or corrosion.
Inhibitors may also be added to the motor oil. Many motor oils also have detergents and dispersants added to help keep the engine clean and minimize oil sludge build-up. The oil is able to trap soot from combustion in itself, rather than leaving it deposited on the internal surfaces.
It is a combination of this, and some singeing that turns used oil black after some running. Rubbing of metal engine parts inevitably produces some microscopic metallic particles from the wearing of the surfaces. Such particles could circulate in the oil and grind against moving parts, causing wear.
Motor oil may also serve as a cooling agent. In some constructions, oil is sprayed through a nozzle inside the crankcase onto the piston to provide cooling of specific parts that undergo high-temperature strain. With these, there are many more things we can say about the motor oil and its necessities.
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