I know, there was such a mod from kenking, but I suggest you check out my version too!
With this modification, for all cars running on a diesel engine (you can find out which engine the car has in handling), the exhaust will turn black when you start off, as well as while driving (most often during gear changes).
Large cars (more precisely, those who have 3 wheelbases, in other words - 6 wheels) will sometimes, in addition to the usual exhaust, “spew” a large gray cloud from their pipe (in a smart language this cloud should be called soot), as in the modification from kenking' a.
Made for some atmosphere, variety and an attempt to slightly increase the role of diesel fuel in the game. Diesel exhaust fumes are always smelly and are often a sign of poor engine condition. I hope this modification will allow you to immerse yourself in the game more and literally smell the stench of the truck you are driving.