Passat 2005 Running On Used Soy Oil And B100

EGR is the least of your worries, do a search on vegetable oil and how you convert it to biodiesel, stripping off the glycerol off the backbone of the Esters. Burn glycerol (from WVO), and it leaves a sticky mess, just like it does in a frying pan when you have a kitchen fire. All that goo ends up in your piston lands and rings, sticking and gumming up your rings, your motor oil (no wonder your oil pump chain failed) as a by product of combustion of any vegetable oil, waste or otherwise.