A rusted out gray market 79 6.9 was my first mb.
They are fast even by today's standards.
The 6.3s are more 'classic' imho.

As far as I can tell,

They all have suspension problems sooner or later.
Might as well carry a gas station in the trunk.
Dry sump setup eventually leaks.

Snub a Mustang from 60+ mph and all is forgotten.

Seems the 6.3s are costing more.

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82 300D....went to MB heaven
90 350 SDL....excercising con rods