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機油有全合成、半合成、酯類油等,功能性差異會大嗎?


其實任何品牌的機油都是以基礎油+添加劑的配製,基礎油佔95%的比例,然而基礎油也有等級之分,以API為例,不同精煉的方式分成Group I到Group V最高等級,也就是所謂的礦物油、全合成油、半合成油等。其中酯類油種等級最高,因為它有著低溫流動性、穩定性和抗摩性的優異表現,全合成油(100% Synthetic)使用的第四或五類基礎油背景(100%PAO或人工酯類調配)的高油品,其穩定性和抗衰退能力非常好,換油的里程數最長,相對於半合成油,是在第三類基礎油調製的油品,抗衰退能力自然比不過全合成油,換油里程數比較短,但相較全合成油的價格差30%以及考量到引擎負荷輕的小車環境,還是有市場價值。

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