If you pull down a mil a year-you should still be investing it in something that doesn't lose big bucks instantly. I think the old benzes are a great investment-American car companies won't build diesel cars(& if they did imagine the reliability  )-pretty soon we'll all be burning biodiesel anyway-unless you're using that mil a year to pay for your gas! 
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1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle  )
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K
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