Quote:
Originally Posted by undata
I've been operating a clean diesel for fifteen years.
|
15 years ago (1997) the diesel NOx emissions standards were 25 times higher than today. PM standards were 5 times higher than today.
"Clean diesel" generally refers to ULSD fuel--which didn't exist in the US until 5 years ago (2007).
I'm not sure how you had a "clean diesel" 15 years ago.