Originally posted by WPRESTO Be safe - do not breathe.
Another fun fact.
The modern diesel engines in heavy trucks (like I drove for 5 years) produce cleaner air than they ingest to mix with fuel for the work they perform.
That's right.
The air coming out of a diesel engine in an over the road truck is cleaner than the air going into it.
The diesel particulate filter (DPF), urea injection and secondary catalytic reduction (SCR) (all exhaust aftertreatment devices), and water cooled exhaust gas recirculation (EGR) clean up more than 90% of the emissions from combustion of the fuel/air mixture.
So follow a big truck around and breathe easy.
Oh, and back on topic, a macro by crop closeup of the factory mismatch of two panels on one of my Z cars. The assembly line mechanic managed to get a pucker when spot welding the rear valance and right rear quarter panels together, and simply filled the gap with seam sealer and it was primed and painted.
It has held up well for 48 years.