13 Sep The oil composition and function
The composition of the oil can be divided into two main parts which are the “base oil” and “additive”. Base oil is the main ingredient that determines the basic properties of oil in food additives, make up and so on.
Base oil is divided into two categories which consists of “mineral base oil” and “synthetic base oil”. Mineral base oil is made from crude oil, the mineral base oil with ester or polyalkene to replace, is a synthetic base oil. If the base oil esters or polygene class to replace completely, is a fully synthetic engine oil. If only partial, it is half a synthetic engine oil. Mineral-based oil is most widely used, in addition to vegetable and animal (because of few production reasons).
The role of engine oil in an engine
Unlubricated engines contain many mutual friction movement between the metal surfaces. For instance, in between the piston and cylinder, besides between the shaft and bearing.To prevent the parts from wearing too fast, you will need to make an oil layer between the two surfaces, so as to achieve the purpose of reducing wear and tear.
Cooling oil to heat back into the sump, then send out to help tank engine cooling in the air.
The oil seal leakage protection can form a seal between the piston and piston ring. This reduces the leakage of the gas and prevents pollutants outside from entering.
Rust corrosion protective lubricant can adhereto the surface of the parts to prevent air, water, acid and harmful gases from coming into contact with the parts.
Shock absorption when the engine cylinder pressure rise sharply, sudden intensification piston, piston, connecting rod and crankshaft bearing load is very large, after bearing lubrication, the load to bear impact load have the effect of the buffer.
Washing clean good oil to engine parts of carbide, sludge, wear and tear on the metal particles, back to the machine fuel tank, through the flow of the lubricating oil, wash the parts of dirt on the working plane.
Understanding erroneous zone
When oil has darkened, the oil change this kind of understanding is not comprehensive. For quiet dispersant without oil, the color black is oil has seriously deteriorated performance, but now the automobile lubricating oil is generally used with quiet breaking agent. This quiet agent can be adhesive film on the piston, and black carbon deposit catharsis, and dispersed in oil, reduce the generation of high temperature and sediment engine, oil use after a period of time it’s easy to get the black color, but at this time of the oil has not completely bad.
Oil could add more quantity of lubricating oil where should be controlled between oil feet of upper and lower scale line as well. Because too much oil from the clearance between the piston and cylinder, burning into the combustion chamber carbon deposit. These carbon deposit will improve the engine compression ratio, increase the tendency to produce detonation. Formation within the cylinder is also easy to cause preignition red status, such as falling into a cylinder will aggravate wear of cylinder and piston, will also accelerate lubricating oil pollution. Secondly, excessive oil increased the crankshaft connecting rod agitation resistance, increased fuel consumption. (some businesses may lobby for the owner to add too much oil, thereby increasing fee, you don’t fall for it.)
Oil is not only adding supplement, not only change can make up for the inadequacy of the oil quantity, but can’t completely to make up for the loss of the lubricating performance. Lubricating oil in use process, due to pollution, such as oxidation quality will gradually decline, at the same time there will be some consumption, reducing the number.
How often should the oil be changed each time?
Maintenance needs to be carried out in accordance with the maintenance cycle in the manual, which is generally one in every 5000 km or half a year. This only applies to those who often drive on the highway and rarely stop. If one drives in the city, their vehicle tend to frequently alternate between stopping and starting due to traffic congestions, which leads to the formation of a lot of carbon in the engine. In this case, it is recommended to shorten the maintenance period.
Vehicles using different kinds of oil have different maintenance cycle too.Mineral oil and synthetic oil are not identical, hence different vehicles will have different maintenance cycles.
Extreme climate conditions will also reduce the service life of engine oil. For instance,driving through dusty, sandy and roads with gravel can cause oil filtration congestion and pollution.Driving in areas with the temperature below 20 ℃will cause oil deterioration, thus shortening the service life of engine oil.
True and false identification
Look at the oil seal packaging. Regular brands have a sealing flap on a one-off lid with gaps that are foil-sealed. The manufacturers’ foils have a tight and special markers and the tin foil seal has a circle mark. Without these characteristics, the oil is most likely a counterfeit product.
Observe the oil color. Normally, qualified oil has a light transparent color without any impurities, suspended solids, and sediments. Fake oil often is darker in color and may contain impurities or sediments, besides having less liquid sloshing around when shook.
Check the smell of the oil. Certified oil almost has no sensitive or distinct smell as it has a light faint scent. Fake oil has an obvious disgusting smell.