Before I switched to Delvac 1, I ran Esso XD-3 0W-30 in winter in my heavy equipment and personal equipment. In summer, I ran Esso XD-3 15W-40 in all my equipment.
Even +22 years ago, I thought the Shell Rotella was overpriced for what it delivered. Why pay more when a comparable oil offers just as much, if not more, for less? It seems every little burg in Canada has an Esso Bulk Plant so the XD-3 is very easy to find.
Always had excellent results. Those folks appear to have good engineers working for them.
Matter of fact, if the price of Delvac 1 goes any higher, I may be tempted to go back to Esso XD-3.
Another fact I'm sure you've noticed: Unlike Mobil, Esso has no problem publishing very detailed oil test results.
I've already helped some folks find a good cold winter oil for their cars, which is the Esso XD-3 0W-30. It seems you can't get Mobil 1 0W-30 in Canada, and the Esso XD-3 is almost as good. Also half the price of Mobil 1 5W-30, with better cold temp results than M1 5W-30.
Call Imperial Oil techline and see what they recommend for running the XD-3 0W-40 in summer. They don't recommend running the 0W-40 in summer in heavy equipment. Cat and Cummins have a cutoff of around 20 C / 68 F.