The difference that refining makes

Just in case anybody thinks diesel engine fuel standards have not made a difference, check out the smoke here at the beginning of this clip from the marvelously campy 1980s mini-series Monte Carlo. You don’t–or you shouldn’t–generally see this level of particulate emissions from any diesel engine at this point due to much more stringent refining requirements, both in the US and and in Europe.

And you get Joan Collins and George Hamilton!