通常情况下，变速箱油分为七个黏度等级，分别是：70W、75W、80W、85W、90、140、250。 W是英文Winter的缩写，表示冬用。W前面的数字表示低温粘度 ...

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Please note the value of investments can go down as well as up so you may get back less than you invested. This information is not a personal recommendation for any particular investment. If you are ...