I've gone through this whole topic. Frankly it looks less about oils and more about shell's advertisement. lol. In every paragraph, they've mentioned about shell do this and it does that....etc.
Well, I have gone through many topics about oils and different people have different views about the oil choices with respect to their cars, driving conditions, weather, atmosphere, etc. etc. or we can say there are "hundreds of myths" about oils are available. BUT.... the most important is that how wisely we choose the oil for our own car. That’s all !!
Here I can write down more than 10 logical based benefits to consume imported oils. But if 100 people will gone through that topic, then hardly 1 guy (or maybe none) will agree with that. Because we all have different schools of thoughts. But all the 10 logical explanations that I'll write, all it will come from my own experiences & practicals. But how many people here agree to change the viscosity of their engine oil or even brand name, unless they confirm from minimum 10 other people. And if 11th guy says some different views, then again the asker will go in big doubt. lol
Hence choosing oil wisely for our car is not a big deal. Just we have to go little deep to understand the requirements according to our own driving style & conditions, situation, roads, atmosphere, car, engine health, etc..
And more importantly, we have to be mentally ready "to accept" that there are many other oils of better performance are available in market than that oil which we are consuming.