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美国石油学会
齿轮油分级代号
美国石油学会对车用齿轮油共分六级: GL1〜GL6。GL1使用性能最低,GL6最高,目前常用 GL3(普通齿轮油)、GL4(中负荷齿轮油)、GL5(重负荷齿轮油)。GL3不能用于双曲线齿轮,GL4〜GL6适用于双曲线齿轮
auto.
gear lubricant
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