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Thanks for the answer. So is the emissions of this 4-cylinder diesel greater than other approved diesels (larger engines) on the road today? Or is it a matter of % to the size of the engine.
What I'm trying to get my head around is this: how bad are these cars polluting compared to other diesel cars and trucks (passenger vehicles) on the road today? Thanks.
There are a couple of issues. The US emissions standards were changed and are tougher than even EU.
In order to meet those standards most diesel engines need a sophisticated (aka expensive) urea system to lower NOx emissions.
Basically, all manufacturers found that it was impossible to build a small, affordable, diesel, that gets good mileage and has low emissions.
VW claimed it found a way, and actually touted it pretty loudly. Unfortunately, they really couldn't do it, and had to rig the elections, I mean tests.
So, do emit more pollution than larger diesels. Yes, at least NOx (which is bad).
How bad are they? Up to you to decide. Probably better the Bro Trucks, and older diesels.
I'm not sure how emissions are measured (parts per million, etc), so it might be that their exhaust has higher levels of pollutants, but since it's a small engine, it has pretty low amounts of exhaust, so overall, in tons of CO2, etc, they might not be that bad.