這 ... 還以為是 common sense 了, Mobil1 不是改基礎油很久很久了嗎 XD
現在除了一些歐洲油, 其他地區用 G3+ 基礎油的產品, 廠商都貼全合成了
說起來還是 Castrol 先帶頭改的, 我家 Mobil1 很乖的, 都是 Castrol 帶壞的 
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.
在90 年代晚期, Castrol 開始賣由GROUP III基礎油製造的機油,並命名為"SynTec Full Synthetic"。Mobil 控告了Castrol, 根據這油不是全合成的, 簡單地說只是高度被精煉的GROUP III石油基礎油, 並且因此它是不實廣告不能稱它全合成。1999 年, Mobil 輸掉失了這場訴訟。這場官司決定了這個詞"Synthetic" 只是個行銷的名詞, 和生產方法或原料並無關聯。Castrol 繼續用GROUP III的石油基礎油生產SynTec機油, 那是高度是被精練的礦物油,並且去除所有的雜質。在Mobil 輸掉這場訴訟之後, 多數機油廠商開始在他們的全合成油使用GROUP III石油基礎油,來取代PAOs 或Polyol Esters作為他們的主要組分。大多數"全合成油" 您能今天買實際上主要由這種Group III精度蒸餾的和極度淨化的"恐龍汁"製成。Group III石油基礎油的成本大約是全合成的一半。由使用Group III石油基礎油混合和少量所謂"真正的"全合成機油, 機油廠商可以製造出跟所謂"真正的"全合成機油一樣等級的產品, 並且幾乎費用和都一樣。
http://www.dle.com.tw/tw_news_detail.php?n_id=11
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