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The all aluminum engines usually last longer than cast iron (with the notable exception of the Chevy Vega engine!) because the cylinder walls are coated with a silcate material. Looks like opalescent glass, and is MUCH harder than the rings. No wear at all unless seriously overheated, in which case the coating will fail.
No visible wear at 300,000 miles on the one I saw apart. The bearings are the same, so is the crank, should last forever.
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!
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