Patman,
If there was such a thing, the #700 would qualify as an 8W-40!
Justin,
A company can always label their products as exceeding a less demanding spec. 15W-40 oil has a reputation as robust, broad shouldered, tough stuff. 10W-40 has a reputation as an oil with problems, although most folks never knew or don't remember the problems, and the problems were with previous formulations years back--I'm not sure the concerns are still valid. Anyway, oil labeled as 15W-40 will likely sell better to diesel engine owners, and if it allows the engine to crank and start easily because it actually flows better when really cold, so much the better.
Ken