One of the things that forced reformulation of diesel oils is the ULSD. Oil had high TBN to deal with the sulfur in fuel before, but without the sulfur the additives were causing problems in diesel engines.

Other changes involve anything that can damage a catalytic converter, something that most oil companies didn't worry much about with diesel oils.

I do like the old Delvac 1, hope that the changes are updates and not ways to cheapen the oil, I'll be watching and reading.

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Gone to the dark side

- Jeff