Yeldogt,

I think you're right in saying these cars are "old". Regardless of mileage anything is suspect and most likely due for replacement. The weight of these cars kills rubber and other suspension pieces.
That's probably why they have complete bushing replacement kits available. Shocks and springs would also be due if original.

__________________
Rick

'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac