Also, this company went from V10 (in 1990s) to L6 (after 2014, when V8 was also dropped). In fact, everyone except
Scania have only six cylinders in the current generation.
A big step down after 12-cylinder two-stroke
Detroit Diesel 12V-71 which sounded like it has four times more RPM than the current truck engines
.
OK, I am agree that those old engines had the awful efficiency and emission. Even 50cc scooter engine is considered dirty when it has two strokes.