So does anyone run a magnet in the fuel when polishing to pull out soluble iron? Another thing I would use for any alternative fuel of unknown origin , particularly recycled stuff is a ph meter. Just a sample of your batch partitioned with water and you can quickly tell if the ph is in range. I have a friend who ran basic wvo in a 01 powerstroke and killed the injectors in a couple hundred miles of burning it
The supplier had forgotten to mention they had used NaOH to clean the fryer.