Originally Posted by Jooseppi Luna

I don't think that it had SLS at all. The 6.9 had the aforementioned suspension.

Originally Posted by shadetree77

yes, the servo is probably the most problematic thing on the W116 300SD and rather expensive, so make sure the climate control does what you tell it to do (keep in mind that it does take about a min to go from max heat to max cool). also check the steering coupler for excessive play (some will have lost all the rubber bushings), easy to replace though. check the floors and make sure they aren't wet; sometimes the sunroof drain lines will come loose and let water into the front footwells. also check under the fuse box where all the wires go through the firewall; push around to make sure there is no rust hole there (it's common for water to collect right there).