Synthetic Blend Oil? Gimmick?

I run Motorcraft synthetic blend 5/20 in our 04 Escape. It has a tic over 180K on it now and burns no amount of measurable oil between changes, so it seems to work for me. Plus, that's what Ford recommends.
5/20 ?

5 % synthetic, 20 % dino oil, and the other 75 % ?


:poke: