Shell, Exxon Mobil, Cheveron, Sinopec, etc. are good & big international companies.
But its also true that they don't have single factory to supply their products to the whole world.
I'll grow old by writing it number of times, that quality of the shell's or total's or exxon's or cheveron's, etc. engine oils are different with respect to countries. Plz understand this open truth. Quality of the lubricants varies from country to country. Because Toyota's cars Made in Japan, Made in USA, Made in Europe, etc. all cars are not same. There are some differences. Similarly Mobile companies, Electronics manufacturers, etc. etc. there are number of examples for us to understand.
All the base oils is coming from SA & UAE mainly. But its been blended with additives over here. "Fuel Quality is also very very important factor". I know Zulfiqar will never get agree on it, but I've already asked it to number of people and just zulfiqar is the only one who is just disagreeing with it because he want to keep his dominance as a keeper of superior knowledge. But its true, fuel quality is among the major factors that effect.
I personally call Shell, Caltex, Castrol, etc. are local companies because they are blending oils here.
I've tons of knowledge to share here, but always think about the ignorance of the majority who will oppose first rather than being agree.