Didn't see this question about the HyVis Oil until now - sorry about that!

The Sun Oil Company of Canada was the importer/distributor of HyVis products into Canada for a time - until about 1932 or so, it looks like. Can't say for sure from when... I have a few letters from a plant manager at a HyVis plant the used to come and visit my grandfather here in Canada, and go duck hunting. He used to invite lots of suppliers/customers here to do that.
Here's a desk blotter that's dated 1925 on the back:

Always looking for Texaco Canada, Supertest, White Rose, McColl Frontenac, and Miller Oil Co. info.