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Message: <blockquote data-quote="Schwepps" data-source="post: 360607" data-attributes="member: 3592">BTW, in American oil blending and marketing, there are few rules. A 100% G-III can be called a fully-synth. The proportions of semi-synths are not mandated, so a semi-synth can be 100% G-II, and if the additives are synthesized hydrocarbons (which they are) voila! That's a semi-synth!Buying US oils is basically paying the freight and tax of an imported, heavily marketed oil. There are exceptions, Mobil One being the main one that's truly fully-synth. Use the price as a guide. If you can buy a fully-synth American oil at half the price of Shell Helix Ultra AB, Petronas Syntium 3000 and Mobil One here, you know what it is that you're actually buying then... And you know which example of 'racing oil' I'm talking about. :wink:</blockquote>