Some diesel models in some countries have a cumulative odometer in the left rear wheel hub, spotwelded cover. This is for tax purposes (for taxi use, I presume), and I don't know if any diesels here have them.

There is a procedure in the W124 manual for reading it and re-attaching the cover with a weld.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!