And just to prove that your 400E isn't alone in it's durability, my 92 400E just passed 275,000 miles as well. I've only had it a year, but I have rebuilt the upper wiring harness, put in new struts, and at present I am rebuilding/resealing the power steering system (what a job!). Always great to hear about exceptional mileage on a Mercedes-Benz.

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out