I've been running Waste veggie oil (WVO) for 12 years, UNCONVERTED, over 100K mostly on 2 W123's, but in above freezing weather only.



I have had few problems. One became difficult to start and ran noticeably poorer after about 40K. I took out the injectors and cleaned them as per another thread on the forum, and found that there was some crud on the bottom near the little pin, but the insides were quite clean.


As per another thread, i soaked the rings in Marvel mystery oil for about a week to eliminate possible stuck rings. Ran great after those 2 treatments, and still running fine after another 15K.


Conversions that screw up getting coolant or air in the fuel seem to cause most problems. I also get good quality oil, not cooked to death, and let the WVO settle a good while before filtering to 1 micron. I add about 2 gallons of gasoline per 55 gallon drum, less in hot weather, a little more if it is cold out.


If both these cars died tomorrow, they would have paid for themselves several times over in fuel savings.


This forum has been so helpful and i am very thankful.