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Ah, that makes sense. I'll bet the silicon dioxide surface is porous, too, so that bore wear is insignificant so long as you don't seize a piston due to overheating, and the rings should likewise last forever.
Certainly Benz does a much better job of this than GM did with the Vega engine -- imagine, an aluminum block (high silicon dioxide, to be sure) with a cast iron head. Usually blew out about 30,000 miles, I think they eventually reverted to cast iron liners to fix the problem.
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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