What I'm doing to run clean WVO:
Getting clean oil.
Filter into 55 gallon drum thru old shirts or bedsheets
Letting this settle 5-7 days (allows water and any sludge to settle to bottom)
With rotary hand pump from Harbour Freight; pump off top into 2nd stage of filtering; A 5 micron (McMaster Carr) bag filter.
Let settle a day or more; then pump from top into 5 gallon fuel container & blend with 1 gallon of RUG; 2 oz Powerservice Cetane Boost; 1 oz Acetone.
For additional water /condesation / microbe protection adding 1 oz of this enzyme catalyst;
http://www.starbrite.com/whatsnew/2004%20BoatUS%20Ad%20(Startron).PDF
I was reffered to this by forum dude and after reading this which is on the bottle neck brouchure I am sold....1st 1 oz today is in and I will be checking fuel filters for progress. Alot has been posted about dewatering WVO prior to adding to the tank, but that doesn't address the condensation that happens once it's sitting in the tank.
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