10 minutes ? running at idle?

I've only had one vehicle "Smogged" an '85 VW Golf I-4 N.A. 1.6 L Diesel
in Jacksonville (Duval County).in 1997
No Modifications to the Factory setup,so I know it was Dirty.

The technician simply measured the exhaust stream Photo-Optically.

Car Passed.

I'm sure the emissions tests now are much more stringent.

'Cause that wasn't a test,it was an amusement.

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D.F. ,

If there's ANY chance your Jurisdiction will look under the hood
(And be intelligent enough to understand the EGR/Wastgate mods)
It would help if most everything "looked" normal.
Do a Lubro Moly "Diesel Purge" fuel treatment + Then an Italian Tune UP before the Emissions test.

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'84 300SD sold
124.128