i have had used this product before. im with the biodiesel club from the hight school i go to.
the teacher and i bout a bottle of this dse and ran a batch as the instructions said, it ran in my 85 f-250 6.9 and his diesel car great. but when we used up all the dse oil we dicided to run a batch with out it, it ran great as well. we have probably made 1000 gallons of just used (filtered) oil + 20% diesel + 5% gas and have had no problems