机油5w40和5w30的区别,w什么意思（Whats the difference between 5w40 and 5W30 in Oil w）.docVIP

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机油5w40和5w30的区别,w什么意思（Whats the difference between 5w40 and 5W30 in Oil w）.doc

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机油5w40和5w30的区别,w什么意思（Whats the difference between 5w40 and 5W30 in Oil w）

机油5w40和5w30的区别,w什么意思（Whats the difference between 5w40 and 5W30 in Oil w） Whats the difference between 5W40 and 5W30? W? Grade index The grade index of oil is usually used by the American Petroleum Institute (API) standard. API is usually expressed by two English letters, the head of a suitable engine oil English letter category, S on behalf of gasoline engine oil, diesel engine oil C; second English letters on behalf of the oil level, in alphabetical order has second letters arranged more represented higher quality, can provide better protection for the the engine such as APISL, APISJ, SH, SG than the engine oil level higher. In general, high-performance cars use APISL or SJ grade oils; in general domestic models use APISG or SF grade oils. Can also be in accordance with the engine manufacturing period to choose oil, SF is suitable for mid 70s or late 80s SG gasoline engine; for the latter part of the 80s SH gasoline engine; for after 1993 1998 before the production of the engine; SJ is applicable to 1998 after the production of engine. Viscosity temperature index We only know that the classification of lubricating oils is far from enough, and the viscosity and temperature index must be adopted to select the oil. Viscosity index: internationally recognized classification is the SAE classification, and SAE is the acronym for the American Society of automotive engineers. SAE classification, divided into low viscosity grade SAE0W (W, 5W, 10W on behalf of the winter), 15W, 20W, 25W, the smaller the number, on behalf of low temperature operation better, such as the representative of 0W at 30 degrees below zero still maintain good lubrication; 25 degrees of 5W; 15W represents 15 degrees below zero; 20W represents 10 25W is 5 degrees below zero degrees below zero. In addition to the low temperature viscosity grade, there are high temperature viscosity grades SAE20, 30, 40, 50, 60, and the greater the number, the higher the viscosity of the oil. Usually when the weather is