Redline in each gear (otherwise known as maximum speed for each gear). Do not exceed that speed, especially on older engines, as they tend to do nasty things like throw rods out the side of the block when you do.

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!