That is the only oil that my uncle will use. He has Cat (2-3406's), Cummins (8. 3, VT555, 855), Allis-Chalmers (in his 2 tractors), Navistar (2-7. 3L IDI/NA), and Yanmar engines in his trucks and tractors.
A little pricey, but very good oil.
He has never had an engine problem/failure that was related to the oil. I have helped him work on some of his engines (head gaskets due to coolant leaks).
He did have an engine fail in his Allis 7060 tractor, but it was because of a headgasket that caused a loss of coolant, The guy that was running it failed to notice, and overheated it. Prior to that, the engine had over 8,000 hrs. on it, and was never opened opened up for any reason.