不一定.但可以肯定的是這家油廠肯花錢去認證.價格一定比較高.但品質有沒有比較好...各位自己去判斷

機油認證可以用錢買------- American Petroleum Institute美國石油學會 The American Petroleum Institute (API) sets minimum for performance standards for lubricants. 美國石油學會（API）設置了潤滑油的最低性能標準。 Motor oil is used for the lubrication, cooling, and cleaning of internal combustion engines. 機油用於潤滑，冷卻以及清洗內燃機。 Motor oil may be composed of a lubricant base stock only in the case of non-detergent oil, or a lubricant base stock plus additives to improve the oil's detergency, extreme pressure performance, and ability to inhibit corrosion of engine parts. 機油是由潤滑油基礎油組成，只有非石油清淨劑，或潤滑油基礎油加添加劑，以提高石油的去污性，極壓性，並能抑制發動機零件的腐蝕。 Lubricant base stocks are categorized into five groups by the API. API對潤滑油基礎油種類分為五種類別。 Group I- base stocks are composed of fractionally distilled petroleum which is further refined with solvent extraction processes to improve certain properties such as oxidation resistance and to remove wax. 第一類基礎油API Group I－傳統溶劑精煉礦物油，是由石油分餾，進一步改進溶劑萃取流程，提高某些屬性，如抗氧化和消除蠟。 Group II- base stocks are composed of fractionally distilled petroleum that has been hydrocracked to further refine and purify it. 第二類基礎油API Group II－加氫裂解礦物油，是由石油分餾加氫，更完善和淨化。 Group III- base stocks are produced by further hydrocracking(HC) of Group II base stocks, or of hydroisomerized slack wax, (a byproduct of the dewaxing process). 第三類基礎油API Group III－高度加氫裂解或加氫異構化蠟合成油(HC)，是較第二類高度加氫裂解生產的基礎油或加氫異構化蠟合成油，（副產品的脫蠟過程）。 Group IV- base stock are pol yalphaolefins (PAOs). 第四類基礎油API Group IV是聚α烯烴合成油(PAOs)。 Group V- is a catch-all group for any base stock not described by Groups I to IV. Examples of group V base stocks include polyol esters, polyalkylene glycols (PAG oils), and perfluoropolyalkylethers (PFPAEs). 第五類基礎油API Group V是一個包羅萬象的類別，非第一類及第四類所描述的。第五類基礎油包括多元醇酯，聚烯娙基二醇類(polyalkylene glycols(PAG))和perfluoropolyalkylethers（PFPAEs）。 Groups I and II are commonly referred to as mineral oils, group III is typically referred to as synthetic (except in Germany and Japan, where they must not be called synthetic) and group IV is a synthetic oil. Group V base oils are so diverse that there is no catch-all description． 第一類及和第二通常被稱為礦物油，第三類通常稱為合成油（除德國和日本，在那裡它們不能被稱為合成油）, 和第四組是一種合成石油。第五組基礎油是如此不同，沒有包羅萬象的描述。

機油還是在機油成份,跟我們食用油一樣.出問題的廠商不是有GMP認證將近20張,用錢買就有--真材實料成本相對高,利潤薄就用便宜原料,賺取高利潤.