[zipper]

I thought most of the diesel pollution problem was solved when we went to low-sulfur diesel.

Does every (truck) diesel engine after 2010 require DEF?

[Scrambler Bob]

I thought most of the diesel pollution problem was solved when we went to low-sulfur diesel.
= = =

Yep.

Got them real clean.

But that didn’t shut down the economy.

So, put on another regulation. We will shut it down yet.

[SeeSharp]

Does every (truck) diesel engine after 2010 require DEF?

Yes.