Shear strength refers to an oil's ability to maintain viscosity (thickness). The oil molecules are basically long strings that allow the oil to coat the metal. If an oil has a low shear strength the strings will be easily broken physically by the compression and friction between the metal parts. An oil with high shear strength will NOT easily breakdown and will provide better coverage and less wear and friction. One study stated the shear strength was 5 times higher with the titanium. Kendall has used it since 2007 and holds a patent on its liquid titanium as does Castrol on their version. Either one would make me happy! Zinc is a cheaper, less effective additive that as I understand it causes catalytic converter problems and will be phased out.
But the titanium is NOT a component of the
base stock, which is what determines the actual shear strength of an oil, and WHY so many ONLY trust an oil with a majority Group 4/5 base stock makeup.
Titanium is an anti-wear, anti-friction additive (and it is also used to a lesser extent as a detergent/dispersant agent as well, just like magnesium is), and a replacement for; ZDDP, moly compounds, boron, and antimony AW/AF compounds, NOT as a component of an oil's base stock.
(Unless you know something about these titanium containing oils' base stocks which no one else knows, or, more likely, are implying that the titanium's friction reducing capabilities are SO great that they go 'above and beyond' anything else to prevent heat and friction from breaking down/shearing those molecular chains of the oil's base stock???)
I would do without almost ANY ZDDP in the oils I use IF that were a possibility (it has been proven to turn acidic, and corrosive, especially in high{er} PPM amounts), but I am against the drastic reduction of all of the other various, beneficial anti-wear, anti-friction compounds (including titanium) by the EPA, and API standards/regulations, which seems counter-productive to me, as they cannot 'kill' the catcons like ZDDP can and will IF it gets past the rings/valve seals and gets into the combustion chamber.