Diesel engines aren't throttled, so they move a whole lot more air through the exhaust. Less condensation, less acid, and less corrosive gas in there for less time.

I was under the impression that MB exhausts WERE stainless, just not non-magnetic stainless.

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!