That's right, don't trade your OM606 for a CDI just for the mileage as that makes no sense. If you trade, do it for the other reasons. Also it's more than just a several thousand dollar difference. Even a used CDI is easily worth twice as much as your W210.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

Ah, but you see, I plan to ebay it for huge sums of money and say it is capable of running Bio and WVO or SVO. As such, somebody might be stupid enough to bite.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

Yeah, there's a lot of stupidity out there, but the "bio-diesel" / WVO / SVO tactic works better on the buyers of the cheaper, older diesels.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

I know but somewhere there is a fool out there with money that I would love to sell my SVO/WVO capable car to. Someone with more money than brains. A fool with money that needs to have it removed from his wallet. Once can hope

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow