Why are there not many 10W-40 HDEO's?

[FCD]

I posted this thread a million years ago and it's still going? Wow

 

[twigdog]

http://www.kawasakienginesusa.com/engine/accessories/kawasaki-4-cycle-engine-oil

All the unusual flavors.

 

[ofelas]

http://www.amsoil.com/lit/databulletins/g2212.pdf

 

[Jabbo]

There is a Chevron/Caltex Delo 10W-40 HDEO and its SeSemi-Synthetic.