tragically, because of efficiency standards, modern engines are known to burn oil .
Otherwise you may be smelling cars who have had the cats stolen.
Stolen cars, exhaust leaks before the cat, incomplete combustion so bad the cat can’t cover it up. I assume it’s stuff like that.
It’s not whatever tiny bit of oil gets burned in a healthy engine.
A lot of Americans take their cat off on purpose for louder noises.
Additionally, a lot of conservatives love to "Roll coal", and literally will shit up the environment on purpose just because they feel schadenfreude from pissing of an environmentalist.
A lot of old cars also since new cars are so expensive.