I just read the post about there possibly not being enough lubricants in the ULSD fuel, and that started me thinking. Could be a bad thing, but thought Id pose the question, What if I were to put vegetable oil in with a full tank of fuel to try and make up for some lack of lubricity? Has anybody tried, or even thought of this? I know the original diesel Rudolph Diesel built ran on vegetable oil, but would this hurt my engine? I wouldnt have any idea how much to put in or how often. Any help, or experience?