1、我国润滑油粘度等级分类是采用美国汽车工程师学会#8194SAE#8194分类标准，共分为#81940W#8194#81945W#8194#819410W#8194#819415W#8194#819420W#8194#819425W#8194#819420#8194#819430#8194#819440#8194...