premise: yeah well when they went to the started with the newer engines you know when they started putting all that pollution control stuff on the older engines is where they started getting into so much you know trouble because the three fifty with all the you know like well actually i guess here within a couple of years ago anyway was the last i've paid any attention to it the three O five was that that V eight that they put in the the three quarter and and half ton van and it had all the air pump and uh
hypothesis: Older engines created more pollution because they were primarily diesel.