such that virtually no aromatic component is left or synthetic PAO (poly alpha olefin) is used together with additives that impart oxidation stability, rust protection, load-carry performance etc.

• 例如，其基础油的精炼必须使内部基本不残留任何芬芳成份或禁止合成PAO与有利于提高氧化稳定性、防锈性能和承载能力等的添加剂一起使用。