BioDieseLandon,
When you run your WVO line along the exhaust pipe, are you going to measure the resulting temperature? Better use metal line. Every time I've heard anybody mention this idea, the general opinion was that the heating would be hard to control.
I've been running two '80 300 TDs on 90% WVO and 10% RUG for about 3 years. At first I got a lot of clogging of the primary (plastic) filter as the accumulated gunk was cleaned out of the tank. I'm in central California 15 miles from the coast; we get occasional light frost. I'm also using this blend in my '99 E300 turbodiesel. Steve