Ive burned 100 percent in my 7.3 and she loves it. Ive burned 100 percent wvo and she oks it. Ive burned waste oil filtered and she took a dump and told me how much she hated it. Ive got the injectors laying on the garage floor to show you how stupid I was for trying anything other than bio in my truck. Another local runs 100 bio and almost never changes his oil because it stays perfect honey colored. I dont want the carbon build up on my rings to blow my nice clean engine if I run waste veggie. No study has found that waste veggie or new veggie will allow a diesel engine to survive over (I cant remember) but say 200 thousand miles. I currently have 511,000 plus miles on my truck and have just finished my new bio plant. My original numbers calculated $0.94 per gallon to make with a methanol recovery process my second batch ends up being 46 cents. The Koh glycering is super good for the envirornment, grass, fertile, and feedstock up to 10 percent weight. Hope this helps.