I'd do some research into Isuzu small diesels if I were you...

I'd do some research into Isuzu small diesels if I were you before buying.
Even though the bigger Isuzu engines dont have AddBlue but seem to
have found an alternative to keep NOX gas below spec, this does not mean
that the smaller engines have done ditto.

https://thewest.com.au/lifestyle/motoring/isuzu-goes-with-doc-technology-ng-b88977572z

The two biggest global car manufacturers , namely VW & Toyota have obviously
resorted/allegedly resorted to diesel cheat and IMO, the minors too would have been
faced with the same problem namely reduce NOX gas without using the expensive AddBlue
and still get top fuel economy/performance out of their engines.

Perhaps one way to test Isuzu is to ask for the following condition of sale on the contract
for your new twin tub Isuzu:

"That if in the event that this category of Isuzu vehicle is found to have cheated
Diesel NOX gas emissions, that you............................(vendor) will refund this new
vehicle price in full"

If they fail to accept such a contractual clause, then IMO, this should send you a message...eh?