Hindsight is great of course. WVO usage. Destroyed the injection pump, the injectors and the engines compression to some extent. Keeping the car in pretty regular usage is another requirement with this fuel. Strange valve face issues have also been reported.

Unfortuatly a not untypical result. Your compression is probably somewhat higher at this time as well. As I already mentioned nothing is really free in life. It was really bad on this site when the true craze was on.

Over the years I never noticed if anyone had a chemical investigation of their fuel they were using done. Even just for water and glycerin content. Burning waste vegetable oil is a lot different than burning fresh vegetable oil.

I live close enough to a vegetable food freezing and processing plant. If I wanted to burn the waste cooking oil from there. No animal fats would be in it.