I have experience in blending veggie with diesel fuel in a unmodfied truck.

Adding a litre of veggie oil into a tank of diesel adds alot of lubricity to the oil and definately good for the engine.

Personally I wouldn't exceed a 20% ratio even in warm climates. Some run 50/50 which I have back in August but even in Dallas I've noticed unburnt fuel coming out the pipe in the form of white smoke even while the truck is fully warmed.

There is no need to filter SVO - Virgin oil as it shall already be clean if your buying it off the shelf. As far as WVO - Waste oil that should be filtered AND dewatered to at least 5 micron.

If you want to run 100% then you'll need to modify the fuel system.

OR if you want you can just buy Biodiesel at the pump and run with no modifications; According to your location your in Houston, follow the link below for a list of retailers in the Lonestar.

http://www.biodiesel.org/buyingbiodi...tate.asp?st=TX

Better yet if you like to experiment take the little bit of the oil and make your own biodiesel.

http://www.kitchen-biodiesel.com/

Enjoy.

Randy