这一部门来自汽油的稀释另一部门来自粘度指数改进剂的耗损。
This is partly from dilution with blow by gasoline and partly from VI improvers being used up.
如果粘度指数改进剂耗损殆尽0w - 30的最终会变得更稀，像一个纯0粘度级的油一样。
If the VII wears out the 0w-30 will ultimately be thinner, a straight 0 grade oil.
它不添加粘度指数改进剂也就不存在耗损。
There is no VI improver added so there is nothing to wear out.
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