Being in a very tight financial predicament I went way over on the engine oil changes. Going so long between engine oil changes allowed for polymerization of the oil to take place. As a result of this I had sticky lifters, bent push rods and valves, and a plugged piston skirt oilier. I believe this was the down fall of my engine. ( I know, changing oil is the least expensive thing to do. Please don't rag on me about it, I feel bad enough already .)
I had 60k miles on WVO and one piston, the one with the plugged oilier had a lot of carbon and stuck rings on it. I have sent this piston off to a friend to get an opinion of just what happened as far as burning WVO. He reports that there is a probability that I had run too much WVO that was not heated enough, maybe switched before the engine was up to temp, etc, etc thus contributing to the problems. This could be true, however I believe that the cause was the lack of oil changes. At any rate I WILL be back on WVO as a fuel ASAP.
Ken Gardner