The newer diesel engines are much quiter and more efficient then our more ancient 123-series engines. I understand the new S400 CDI is extremely quiet and smooth, and has 250hp!

My dad had a 93 300D 2.5 Turbo when I had my 87 300 SDL and there's a huge difference in the engine noise, engine sound, and acceleration....

I just hope they bring the CDI's over. Otherwise, VW is your best bet for the smoothest/quietest diesel, IMHO.... (but no new TDI Passat)

-m

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Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC