轧制油过滤系统是比较成熟的产品，完全可以实现系统免维护和滤芯长寿命。
Rolling oil filter system is the mature final product, free-maintains system. The filter core has the long life.
解放油罐车两个变量来与一个免标准柴油微粒过滤器，不需要添加剂。
Both variants come standard with a maintenance-free diesel particulate filter, which requires no additives.
所有的沃尔沃的新柴油发动机还配备了免维护的微粒过滤器，过滤器大约百分之九十五的烟尘颗粒。
All new diesel models from Volvo are also fitted with a maintenance-free particle filter that traps about 95 percent of all soot particles.
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