which would you purchase.

[Deplorable]

Delvac.

 

[MSCH]

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…

honestly, it probably doesn't matter on those old diesels, as the oils they specced to run were far inferior to what is available nowadays.

 

[JHZR2]

honestly, it probably doesn't matter on those old diesels, as the oils they specced to run were far inferior to what is available nowadays.

Of course. That was essentially my point.