On the packaging of the oil, we often see SAE and API. Society of Automotive Engineers SAE is the abbreviation, SAE viscosity grade oil level representatives. SAE30, SAE40 single-grade oil, SAE10W-30, SAE15W-40 as a multi-grade oil. Where, "W" in front of numbers smaller the lower the temperature viscosity, engine cold start ability to protect the better; "W" behind the figures is the oil temperature resistance indicators. API is the acronym for the American Petroleum Institute, API grade represents the quality of the engine oil classification. It uses a simple code to describe the engine oil's ability to work. API engine oil into two categories: "S" series represents gasoline engine oil; "C" series represents diesel engine oil; when the "S" and "C" on the two letters exist, it means that this oil as gasoline and diesel universal . Such as "S" in the former, is mainly used for gasoline engines. On the contrary, primarily for diesel engines. From the "SA" until "SJ", incremented each time a letter, the performance will be better than the oil the former, there will be more oil to protect the engine additives. More letters on the list, the higher the quality level, many international brands in the oil level is SF level and above.
      Choose a good oil, make the car more durable, more motivated. Good oil, especially the fully synthetic motor oil in addition to protect the engine, reducing the frequency of oil changes, but also to save fuel costs. Therefore, its price twice as expensive than regular oil is the best choice for many owners.
      According to the  Throttle Body Kero note, select oil should be selected according to the requirements of the engine, it is neither necessary in less demanding on the engine so that the oil is too advanced, nor can you use a lower grade oil engines require a higher .

      Should try to choose multi-grade oil, multi-grade oil as saving, long life, high efficiency, the engine has a good protective effect. Based on the characteristics of multi-grade oil, in the course prematurely may appear black, oil pressure than ordinary oil small phenomenon, were all normal.

      Some domestic brand of engine oil quality is quite good, and the price is much lower than similar imported products, can be freely used, there is no need to blindly pursue "kerosene."

     Such as the engine in good condition, and the seasonal temperature is low, the viscosity should be possible to use a smaller oil to make oil flow. If the hot season or serious engine wear conditions, the choice of high viscosity oil it will help form a film, reducing engine wear.

      Do not simply think that oil is trivial, we must understand some basic parameters, so you can easily choose your future, but also to buy the right car maintenance lubrication is an important work na.
When the liquid flow is called a measure of internal friction viscosity, viscosity decreases with increasing temperature. Most are based on the viscosity of lubricating oil grades. If the viscosity is too low, causing the car to the end of oil over the phenomenon seriously affect the normal dealers.
Density is the lubricant simplest and most commonly used physical performance. The relative density, refers to the given material at a given temperature and at a standard temperature Vapor Density standard ratio of density of the material. The standard material for petroleum liquid is water.
If the viscosity index of the lubricating oil is relatively low, when the temperature rises rapidly decrease the viscosity of the oil, resulting in the loss of lubricating oil, lubricating effect; oil of high viscosity index that small changes in viscosity with temperature, but when the temperature decreases lubrication The viscosity of the oil will rise rapidly, and even loss of mobility, also affect lubrication.
Low pour point is to evaluate the performance of the oil project, and freezing point should be as low as possible.
When heated to a certain temperature when the oil level in the instantaneous generated blue flame. But not continuous combustion. This temperature is called the flash point of the lubricant. In ℃ expressed. Oil flash point above 45 ℃, highly volatile oil in the working process will be easier to evaporation losses, serious and even lead to lubricant viscosity increase, affecting the use of lubricants. General requirements for oil flash point than the use of high temperature 20 ~ 30 ℃, in order to ensure safety and to reduce evaporation losses.
Most of the oil is allowed only traces (less than 0.3% water content) of water, because water can make the oil emulsion, the additive decomposition of the oil and to enhance the oxidation of low molecular weight organic acids on the mechanical corrosion, impact oil temperature mobility.
According to the  Throttle Body  Kero noted, both in the use of, or the purchase of these parameters are very important, more than those of the Department of the lubricant base oil quality has a certain impact, and whether the oil has decided car better able to travel, so pay attention to these knowledge maintenance on your car is very important oh.