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便宜合成油英國Castrol-率先發起
In the late 1990s, Castrol started selling an oil made from Group III base oil and called it SynTec Full Synthetic. Mobil sued Castrol, asserting that this oil was( not synthetic), but simply a highly refined petroleum oil, and therefore it was false advertising to call it synthetic. In 1999, Mobil lost their lawsuit. It was decided that the word "synthetic" was a marketing term and referred to properties, not to production methods or ingredients. Castrol continues to make SynTec out of Group III base oils, that is highly purified mineral oil with most all of the cockroach bits removed.
Shortly after Mobil lost their lawsuit, most oil companies started reformulating their synthetic oils to use Group III base stocks instead of PAOs or diester stocks as their primary component. Most of the "synthetic oil" you can buy today is actually mostly made of this highly-distilled and purified dino-juice called Group III oil. Group III base oils cost about half as much as the synthetics. By using a blend of mostly Group III oils and a smaller amount of "true" synthetics, the oil companies can produce a product that has nearly the same properties as the "true" synthetics, and nearly the same cost as the Group III oil. The much more expensive traditional synthetics are now available in their pure forms only in more expensive and harder to obtain oils. To the best of my knowledge, Delvac-1, AMSOil, Redline, and Motul 5100 are the only oils made from pure traditional synthetics
翻譯已修正-很抱歉 英文高手幫忙
在90年代初， Castrol開始賣所謂的全合成機油(SynTec Full Synthetic)，但是此全合成是從第三群礦物基礎油提煉所做的油。並非是化學合成而來的酯。
因此MOBIL對Castrol提出訴訟，斷言這油不是化學合成的，而是完全高度被 "提煉" 的石油，並且它是称它為"合成"( Synthetic)是引導錯誤所做廣告。
但是在1999年， MOBIL丟失了他們的訴訟。 決定了" synthetic" 是機油市場用詞，不是在說明此油酯的生产方法或成份。
所以Castrol继续販賣以礦物油為基礎的機油之合法性，加上MOBIL丟失了他們的訴訟，從此絕大多数石油公司開始改變原本應該要使用成本比較高的化學合成的PAOs或diester作為他們的基礎油，改成為以較便宜的第三族群高度提煉的礦物油(Group III oil).合成的基礎油來販賣所謂的合成機油"synthetic oil"
所以現今市場上的"synthetic oil"都是以第三族群高度提煉的礦物油當作基礎油製成，而成本價格卻只要以合成油當作基礎油的一半成本，然後再經過以大部分的Group III oil礦物油 .再加上少量真正的化學合成酯(synthetic oil) 就可以做出和 使用PAOs或diester這些高價化學合成酯為基礎油的合成機油接近的產品，而成本呢? 只比礦物油高一些!! 所以現在要購買以純淨合成酯為基礎油的合成機油，必須花比同產品更高的價位才買的到，當然以合成酯為基礎油的合成機油更加少數
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