our two family vehicles are the same vintage too and the other one is a mercury(nissan) van. i have more miles on the van yet the engine & drivetrain are smoother in operation than the benz. of course, the benz feels much more solid (hmmm, is that all?) but it's such a contrast considering that the benz cost twice as much as the van when new!
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"