Not one standard answer

[DrewL]

Never have I experienced the variety of answers to this question, "I have older diesels, do I need to add an additive to protect the longevity of what I have?"

Direct question to the only diesel (ULSD) available.

Simple question yet complex answer

HELP?

 

[cp1969]

No.

It doesn't get simpler than that.

 

[MadReferee]

"I have older diesels, do I need to add an additive to protect the longevity of what I have?"

No.

For references see:

Chevron Diesel ULSD FAQ

Clean Diesel Fuel Alliance