机油5w40 和 5w30 的区别,w 什么意思(What's the difference between 5w40 and 5W30 in Oil w) 机油 5w40 和 5w30 的区别,w 什么意思(What's the difference between 5w40 and 5W30 in Oil w) What's the difference between "5W40" and "5W30"? "W"? Grade index The grade index of oil ...
机油5w40和5w30的区别,w什么意思(What'sthedifference between5w40and5W30inOilw) What'sthedifferencebetween"5W40"and"5W30"?"W"? Gradeindex ThegradeindexofoilisusuallyusedbytheAmericanPetroleum Institute(API)standard.APIisusuallyexpressedbytwo