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I have heard the stories about those JASO MA-certified diesel oils such as Shell Rotella and Delvac, but those seem to be USA-specific. I think the Shell Rotella lineup isn't even brought over to Europe, replaced by Shell Rimula instead, which doesn't have nearly as many suitability endorsements.
Sure, I bet that basic mineral oils (esp. those "heavy duty diesel" or "fleet/multivehicle" ones are so, well, basic, that they don't contain any fancy friction modifiers, but JASO certs cost so nobody does them if they don't have to.
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