Motul - Calcium Sulfonate, what that?

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I have found a disclaimer on a 300v 5w40 can. I wonder what actually does Calcium Sulfonate do?

Motul.jpg
 
Mobil uses it in their Centaur Moly 1 grease. Don't know if it has the properties in motor oil.
ExxonMobil Mobil Centaur Moly 1

Unlike conventional soap-base thickeners (i.e. lithium, aluminium, and calcium soaps), the calcium sulfonate thickener does much more than simply impart consistency. It imparts excellent corrosion and water-resistance properties to the grease and has inherent extreme-pressure protection properties that enhance load-carrying ability.
 
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