Well I have been running a two tank WVO system for about 15K miles with no problems at all. The oil is always around 175*F before I switch over from diesel.

Over the past 5K miles I have developed a "nailing" type noise. It only happens when the car is warmed up, doesnt matter if it is running on diesel or WVO.

I orginally thought that it was just a screwed up injecter, until I cracked each injector line one at a time and the noise never went away. Maybe I have two injectors bad? not sure?

The noise only happens at idle (around 600rpm) and totally disappears at 900-1000rpms ....

Check the video to hear it ...

NAILING VIDEO