In message , at 08:05:21 on Tue, 29
Sep 2015, News remarked:

Perhaps you interpreted what I meant incorrectly, unlike VW, other
German cars had the same emissions in road tests as they did in formal
testing.

This is the point I worry about. Is it really realistic to assume that
VW engineered diesel engines are so much worse that any others that
they require cheating to pass standard tests?

They are worse because they purposely left off the AdBlue system. Other
more recent VWs with the system, and other manufacturers' cars with the
system, are not "cheating" (allegedly).
--
Roland Perry