Are you sure you want to sell it now? Sounds like you have fixed most of the things that are likely to fail. In fairness, some of the items you list are normal wear and tear items and some of the others are simply age related as you suggest.

We have owned our '90 300TE for seven years now and whilst it has travelled less distance than yours (190,000km), I consider it very reliable and I have no hessitation loading the family on board and embarking on long journeys through remote parts of the vast Aussie countryside. Admittedly ours is not a 4-matic like yours which do have a bit of a "reputation", but I have had to replace some of the items you list.

It appears that everyone loves the 124s for the great cars they are when they are working, but for some it is a love-hate relationship when things go wrong. Possibly for those like me who perform all their own maintenance and repairs, we catch things before they fail and leave us stranded.

To date, I have mostly praise for our 300TE and hope that it gives us many more years of relatively trouble free service (I hope I haven't cursed it saying what I have here). Sorry to hear of the decision you have come to with yours.

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107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.