Agree. That said, and I know that test and situation is many years old now, it still bothers me a bit, because how did Mobil get a CK-4 and Volvo cert? Lying? Cheapening the add pack after?
Did they blend a bad batch and Shell found it?
I agree most don’t operate there - thus my point on if it makes a bit of difference in my 96 Cummins trucks or 1980s MB diesels.
But the flip side is if I paid for a CK-4 oil with a level of anti oxidation and thickening resistance, then I want what I paid for whether I need it or not…