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Choose semi-synthetic oil or fully synthetic oil, is still a dilemma for many owners of a choice. Some people say we should choose semi-synthetic, because the price is low, it is good to change frequently. And some people say, the whole synthesis must be good, because a price a point goods.
Choose semi-synthetic oil or fully synthetic oil, is still a dilemma for many owners of a choice. Some people say we should choose semi-synthetic, because the price is low, it is good to change frequently. And some people say, the whole synthesis must be good, because a price a point goods.
For their own car should choose semi-synthetic cost-effective, or fully synthetic cost-effective, in fact, this has to vary from car to car, can not be randomly added, otherwise not only affect the driving performance, but also may damage the car parts. Let's look at the difference and the conditions that apply.
Different base oil
The biggest difference between semi-synthetic and fully synthetic oils is the base oil.
About 80% of a typical engine oil is base oil. Base oils are usually divided into five major categories, but most of the base oils used in automotive oils are mineral base oils and synthetic base oils.
Among them, the base oil produced by the petroleum refining process is called mineral oil base oil, that is, second class oil. The finished lubricating oil made from mineral oil base oil can meet the general self-priming engine lubrication.
But in high temperature, ultra-low temperature and other environments, mineral oil may not be able to meet the performance requirements, to use some excellent performance of synthetic oil, that is, three types, four types of base oil, and the use of the car is the full synthetic oil.
Full synthetic oil has strong oxidation resistance and good low temperature mobility. The base oil of a good full synthetic oil is made from four types of oil PAO+ additives. If it is a relatively cheap synthetic oil, it may be formed by the polymerization of three types of base oil + hydrogen.
In general, the price difference between synthetic oil and semi-synthetic oil is relatively large, because the base oil is different in nature.
Different service cycles
Second, semi-synthetic oil and full synthetic oil because of the different base oil, and not the same additives, so the two cycle is also different. Under normal circumstances, the regular semi-synthetic oil 5000-8000km or less than a year to replace. This is good for the operation of the engine, if not replaced for a long time will greatly reduce the lubrication effect of semi-synthetic oil; Full synthetic oil replacement cycle can be around 10,000 to 13,000 km, and relatively better protection of the engine.
Withstand different temperatures
Third, semi-synthetic and fully synthetic oils operate in different temperature ranges and protect the engine block and parts in different ways.
Fully synthetic oils are suitable for turbocharged engines and high-performance engines with large displacement and self-priming because they can withstand a higher maximum operating temperature than semi-synthetic oils. Because the turbocharged engine's working condition is relatively bad, sudden pressurization and rapid acceleration not only require good oil liquidity, but also need to have good lubrication and protective film. This is where synthetic oil beats semi-synthetic oil for sure.
The price is different
Finally, semi-synthetic and fully synthetic oils have different prices. From the online query of Mobil oil shop oil prices, the full synthetic Mobil 1 Yinmei 5W-30 4L installed oil price is about 550 yuan, semi-synthetic speed Ba 1000 5W-30 4L oil price is about 250 yuan. In other words, semi-synthetic oil is almost half the price of full synthetic oil.
To sum up: semi-synthetic oils differ from fully synthetic oils in terms of base oil, replacement cycle, temperature tolerance, and price. In terms of their characteristics, all-synthetic oils are suitable for large displacement performance engines and turbocharged engines; Semi-synthetic oil is suitable for economical small displacement engines.
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