It's why new ones are so expensive. It's not just mark up for the name MB but that they use the best parts to make the best car. When you buy one it's a 30 year investment, much like a house. It's built to last for the long haul.
Really is a case of 'You get what you pay for.' Wish I had the money to buy a new one. I'd still buy and old one, but I wish I have the MONEY for a new one.

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Ginny in Denver-ish
78 300SD, 265K (mine)