Because it’s not available in Canada and even when I cross the border into Niagara Falls NY they don’t stock it in the closest Walmart and even when I drive an extra 40 minutes I have had a hard time finding it in the other Walmart there. The last time I crossed the border I ended up having to get it at Autozone and it was almost $40 (about $60 CDN)

I can get ESP here for $43 CDN. And I’m still not convinced that Valvoline Restore and Protect is the right choice for doing 10,000 mile intervals. I feel like it’s more of a 5-6k oil.
For me I’m happy that it’s achieved what I wanted, a very good reduction in consumption. If ESP 0w20 doesn’t keep the consumption at the same lower level I can always switch back to Valvoline Restore and Protect later.