All you need to know about motor oils

Many people ask: What is the best engine oil for my car? And which species should I buy?
The answer to this question requires that we first know the tasks required of engine oil in order to choose the appropriate oil for the engine
First: The function of engine
 oil The oil collects the impurities resulting from the combustion process and makes the engine parts permanently clean. The oil you change is saturated with these substances and therefore it is poisonous. It prevents corrosion of the internal parts of the engine and this by reducing the friction between the internal parts while the engine is running. If you start your car without oil in the engine, the internal parts will grind each other during the internal combustion cycle .
 Therefore, the oil must have a degree of wife that makes it cover all parts of the engine and also reduces the presence of oil from the engine’s exposure to oxygen and thus prevents the oxidation process under high temperatures .
Most motorists do not know the meaning of the symbols on the car engine oil packages, and how they affect the performance of the car and the performance of the engine.
In this article, we will show you how to choose the best car engine oil and also you will learn the meaning of the symbols and codes written on the engine oil package so that you know what oil is suitable for your car and do not leave yourself offering it to sellers to control what goes into your car without knowledge or knowledge.
Several tests were conducted at the American Petroleum Institute ( APL)   to determine the oil’s tolerance and oxidation strength, acid formation, corrosion protection efficacy, oil evaporation, and start-up flow velocity.
There are two types of oils: single-grade oil and multi-grade oil, and each type must be understood to choose the best for your vehicle. Definition of oil viscosity, known as (oil resistance to flow), symbolized by the symbol W)  , and it is written on the oil packaging and also the presence of  W Information on the use of oil for the winter season  W – ” winter ” means ”  winter “.
types of oil

1. Single grade oil (viscosity). It does not change the degree of its viscosity by changing the temperature up or down, and it is prepared from basic petroleum materials, so you will find an example written on the package(W 10)That is, the scale of the degree of viscosity is (10) and does not change with the change in the temperature of the engine, and it is preferable to use it often in old engines 
2. Multigrade oil (viscosity):
   It is an oil whose viscosity changes with the temperature of the engine up and down. It is prepared from chemicals, micro-polymer particles and petroleum materials. This type is characterized by being light and with a low viscosity degree when the engine is cold in the morning, and the oil, for example, has a viscosity degree (10) so the oil pump can pump it quickly to all parts of the engine, and the upper parts in a very short time so as not to be exposed to wear as a result of friction in the morning when the oil is at the bottom of the engine.

 
So that the engine oil performs its main function, which is lubrication. Its viscosity must be able to hold together under extreme heat conditions inside the engine. The consistency of the oil thickens when cooled and becomes thin when heated.
What do the oil numbers mean?
Multi-grade oils are oils that have two numbers in their class and indicate the ability of the oil to maintain engine performance at high and low temperatures as well. The first number on the multigrade oil is followed by the letter W, which indicates that it is suitable for winter. This number shows the viscosity of the oil during low temperatures and indicates how the oil flows in the winter. The first number is lower, indicating the oil that is liquid at low temperatures. The second number, located after the letter W, indicates the viscosity of the oil at high temperatures .

Using the correct viscosity for your engine increases its performance, reduces engine wear and increases fuel efficiency. In addition, synthetic oils often have more high- and low-temperature properties than natural mineral oils. This maintains protection with better fuel economy even during cold start as well.

When did you change your car engine oil?
Some motorists rejoice that the color of their engine oil has not changed after putting it in the engine of the car and running the car for several kilometers. However, the used oil did not do its job and left sediments inside the engine . In order for the change to take place easily and conveniently, it is preferable to be carried out while the engine is hot, then the oil will flow easily and the dirt will come out with it regularly and be removed from the engine better than if the change was made while the engine was cold.
Used lubricating oils are considered residues and waste that are directly harmful to the health of the user because the used oils contain minerals and dirty parts that have accumulated during use. These materials appear when the residues are changed.
The solid contained in the oil (oil filter – filter), which must be emptied from the oil residues whenever the oil is changed, and the necessary must be taken to drain it so that it is neatly placed in designated places and should not be thrown into the surrounding environment
How do you measure the level of engine oil

You must re-check the oil level at least every two weeks. When measuring the level of the car engine oil level, the car must first be in a horizontal plane, and the engine must be run until its normal operating temperature, and then turn off the engine by closing the contact switch and waiting about five minutes, then raise the oil dipstick from its place in the engine and clean it well with a cloth that does not contain lint, then put its place again in the engine and raise and note the oil level, and it must be between the two marks in size and not be higher than the upper mark or less than the lower mark, and it should not be Measuring the oil level while the engine is in rotation, as this will give an incorrect indication of the oil level in the engine .
Attention must be paid to the aforementioned specifications and codes, such as the quality of performance and the degree of viscosity appropriate to the atmosphere of your place of residence. These specifications cannot be changed by any company on its own and must follow international specifications and codes .