Recently, Shell introduced a “long oil change†for the 100,000-kilometer replacement cycle customized by FAW Jiefang JH6. So what is “long oil change� It is a synthetic motor oil that Shell specifically tailored for FAW Jiefang JH6. Different from the mineral oil commonly used in domestic trucks, synthetic oil has many features to ensure long oil change intervals. Many people wonder if the two oils look very similar. What's the difference? Here I'll use a little bit of popularity. What is mineral oil? What is synthetic oil?
Low price, wide application of mineral oil
Mineral oil is a kind of lubricating oil used by domestic trucks. The base oil extracted from petroleum by physical distillation is called mineral oil. It is mainly produced through the process of fractionation, refining and dewaxing by selecting the oil suitable for the performance requirements of lubricating oil. Production is based on physical processes and does not change the hydrocarbon structure. The quality of the base oil depends on the content and properties of the ideal components in the raw material. In the refining process, the mineral oil can not be cleaned out because of the impurities, so the improvement of the quality of mineral oil base oil is limited. This technology cannot break through and mineral oil will no longer reach new heights.
Chemical synthesis, complex synthetic oils
Synthetic oils are lubricating oils that are prepared by chemical synthesis into higher molecular compounds that are formulated or further processed. It includes synthetic esters, poly-α-olefins, polyethers, silicone oil, and the like, and its composition is different from petroleum hydrocarbons. Semi-synthetic oil refers to the lubricating oil made by mixing synthetic oil and mineral oil in a certain proportion. Due to the expensive raw materials of synthetic oils, complicated synthesis processes and high investment, the prices of synthetic oils and semi-synthetic oils are generally higher than those of mineral oils.
Synthetic oil PK mineral oil
Excellent viscosity and temperature and low temperature fluidity: Synthetic motor oil has higher viscosity index than mineral oil, and its viscosity changes little with temperature. At the same high temperature viscosity, most synthetic oils have a lower pour point (or freezing point) than mineral oils and have a low temperature viscosity. With the same oil film requirements, synthetic oil can be formed with a lower viscosity to protect the engine. Therefore, it is possible to reduce the energy consumption of the automobile when it is started at a low temperature and to prolong the life of the battery. At the same time, since the time required for the lubricant to flow to the friction surface is short, it is possible to reduce the occurrence of dry wear of the engine components at startup and prolong the service life of the engine. Whether it is the winter in the north or the summer in the south, synthetic oil can better adapt to the weather.
High temperature oxidation resistance: The thermal oxidation stability of synthetic oil is much better than that of mineral oil type oil, that is, the tendency of acidity and sludge generation due to oxidation is small. Under various adverse operating conditions, the engine can be properly lubricated. And effective protection, and therefore have a longer service life, to ensure the stability of the oil during the long-term use of the performance. This explains why the Shell long oil change can reach a 100,000 km long replacement cycle.
In the same working environment, synthetic oil has a much longer service life than mineral oil, so although the cost is higher, it is not much higher than the mineral oil after the number of oil changes. In the current domestic commercial vehicle market, the most common oil change cycle that can be provided is 4 to 60,000 kilometers. The use of synthetic oil can be used, the number of oil changes can be reduced, and the working time of vehicles can be increased. It is more economic than It is much better than mineral oil.
Low evaporation loss: Synthetic oil is generally a pure compound with a narrow boiling point range and its evaporation loss is far lower than that of mineral oil, which can reduce fuel consumption, reduce exhaust emissions and prolong the service life of catalytic converters.
In addition, compared with traditional mineral oil-type engine oils, synthetic motor oils also have excellent chemical stability, good radiation resistance, and high oil film strength and low foam characteristics.
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