Every car will run for ever if you keep throwing money at it.

IMO, a W140 S600 in in line with a W123 300D in terms of durability.

Just kidding, of course.

One bullet point for the M110 over the OM617 in terms of durability is more consistent fuel. Nobody tries to convert 280CEs to single tank WVO systems and run inadequately filtered WVO.

__________________
1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!