I worked for BMW back in 97-98 in Eastern Europe and sold a few Defenders Diesel I don't remember exactly was it Td5 or 300Tdi but those motors had no emission restrictions for sure, a large "puff" of black smoke at start up and acceleration
Mechanics explained to me that this will run on any diesel fuel -for trucks, tractors, locomotive, no restrictions.
The selling process was easy, I would just drive up some stairs nearby with the customer and "deal closed". We had a few in for repairs - mostly travelers, one from UK what I noticed axles, TC, transmissions where always oil whet but owners wouldn't let us "fix it", just maintenance and keep heading to wherever they where going, Mongolia maybe.
What to say it was a great vehicle.
New one resembles real Defender like renegade resembles CJ7
If comparing to JK, 1998 Defender was closer to J8.