I'm trying to get an idea on the maintenance history. 112k is just break in time for a Mercedes engine. Then again, for a timing chain that could be normal.
How often do you think your family changed the oil in the last 15 years, Meticulous or touch and go. I'm meticulous. I've seen some sorry looking 380 SEs before from people who treat their car worse than I do my lawnmower.
I was told that you may see your tach flucuate a little bit when the timing chain starts to give. DOn'y know if that is true.