Johnny Christensen
Adventurer
The om616 is an underpowered and obsolete motor, also the remainder of the 240GD drivetrain is reportedly of lesser build strength like the smaller axles and driveshafts.
It's true that the four cylinder om616 is underpowered, but they compensated a little with the axle gearing. That means 115 km/hr is the absolute topspeed (68 mph) when is was new. 0-100 km/hr (0-60 mph) is about 35 seconds, though most seems to be in the 40-45 seconds range.
But the drivetrain strength is the same as every other W460 / W461 of that vintage. There are no smaller axles or driveshafts. It just don't have any engine power.