Japanese cars use 0W20 low viscosity oil, some people say that it is because the Japanese machining accuracy is higher than that of Europe and the United States, is this statement accurate? In fact, it is impossible to simply infer that the Japanese machining accuracy is higher, in fact, it is because the style orientation of the Japanese car is different, which is simply to save fuel and fuel.
Gasoline viscosity difference we often see 5W-30, 0W-40, 10W-40 and other oil labels, W is the abbreviation of Winter (winter), indicating that only used in winter, the number after W is the viscosity of the oil at 100 ° C, the larger the number, the higher the viscosity.
In fact, the use of labels to distinguish the viscosity of the oil is not completely reliable, and we can assist in the identification by the certification on the oil packaging. For example, the "dexos" and "ACEA A1/B1" logos mean that this oil is suitable for Japanese, Korean and American cars. If there is a "AECA A3/B4" logo, it means that this car is suitable for German cars. Why do Japanese cars use low-viscosity oil? In fact, not only Japanese cars, including Korean and American cars, are biased to use low viscosity oil, while German cars prefer to use high viscosity oil, which is different from the design orientation of car companies.
First of all, German cars, German cars mostly use turbocharging technology, the gap between the piston ring and the cylinder block of the engine is relatively large, and high viscosity oil is needed to bridge the gap, and the temperature rises sharply when the turbocharged model works, and more viscous oil is needed to ensure the sealing, so many German cars choose 5W-40 oil.
However, Japanese cars are different, due to Japan's small territory and lack of resources, the first consideration when designing the engine is to save fuel. So how to save fuel? The use of lower viscosity oil can save fuel, in addition to cold start and low temperature start effect is also better, but low viscosity oil will also bring the problem of wear resistance decline, how to make up for it? Therefore, the Japanese car takes into account the support for low-viscosity oils in the design place, such as the air valve structure of Chuangchi Blue Sky Engine and the aerobic pump design that takes into account the support of low-viscosity oils. In addition, oil manufacturers also spare no effort to develop low-viscosity oils that can meet the needs of Japanese cars, adding viscosity index improvers, anti-wear agents and friction adjusters and other components, in this way, oil manufacturers and Japanese car companies to make a difference, which allows Japanese cars to widely use low-viscosity oil.
To sum up, Japanese cars use 0w20 low viscosity oil, not because the Japanese machining accuracy is higher than that of Europe and the United States, but because Japanese engine oil is more inclined to save fuel, and the low grade oil is taken into account at the beginning of the design.