how much are you looking at spending to get your little biodesiel factory up and running? how much biodeisel do you get from a gallon of oil? Is there waste? Where do you dispose of the waste? Is there a cost associated with waste disposal? How much can you pay for your dirty oil and still come out ahead assuming desiel sells for $4 a gallon (all it takes is one other guy in your area and the oil may not be free).

How old is your rig? Do you have a warrenty? Are you ok with voiding your warrenty?