VW

VW.

VW builds nice machines.  When I was in Germany on the way to Ethiopia in 1969, I got a used VW mit zwishengasse.  Translation "No Syncromesh" (double clutch).  A fun machine that got us around Europe till the clutch cable broke (easy fix).

Today:  Engines are most efficient at HIGH teperatures. (Diesel Engines are engines). They get the best mileage when the combustion temperature is high. If the combustion temperature is high, and you are using air, nitrogen oxides are formed.  This applies to big power plants also. And truck engines. And stationary engines. And ...

You are building diesel cars. They compete on mileage.  To get the best mileage, you want to run HOT.  The government wants low nitrogen oxides (NOX).  So when the government is watching you should run cool.  When the government is watching, the steering wheel is not moving. Hmm...

So you take out the big brother detecting software.  A third party company quietly  re-installs the high mileage software.  (It is an easy task, should be very cheap).  Everyone is happy again, except the asthmatics who have NOX problems in their lungs.          

Does this flap kill diesels??
Global warming does not see NOX.
We can use airplanes to inject the NOX into the stratosphere.
Maybe wind power is a good idea.