Feels good burning a renewable fuel, huh?

I've got about 5,000 veggie miles on my 190D. I'm currently suffering transmission problems and am working through it with help from others on this forum.

General question regarding the fuel heating: My engine has a built-in fuel heat exchanger for the diesel that is controlled by a thermostat. When the temp drops below 8 deg C the fuel is diverted to the Heat Ex. Is this on most MB diesels, and has anyone utilized it for the veggie oil pre-heat? I imagine it would be reasonably easy to eliminate the thermostat so that the veggie would always be directed to the heater.

The fuel diagram can be see here:
http://mb.braingears.com/201_DISK1/PDF/70006.pdf
go to page 07.1 10.1-010/2 (hey, I didn't number the pages)

Enjoy your new ride!

Paul