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Reasons that WVO damages engine is incomplete combustion during cold start or cold WVO. Any residue WVO will leak down the piston and gel up the rings when it polymerizes. That would run the risk the ruining the engine; scraping the cylinder wall or bad blow-by. WVO also will dissolve the rubber hoses but that would take months if not years. It will etch out all crud in the fuel tank and clog the fuel filters.
There are a number of ways to get round incomplete combustion:
1) running two tanks is best, start with diesel and change over to WVO when engine/WVO is hot. The set up is expensive and the initial investment could be more than what the car is worth. It can be done manually or automatically, depending how much you want to spend.
2) Run a blend of filtered WVO and unleaded gasoline, up to 80%WVO/20% gas. Normally no modification is needed.
3) Single tank conversion. Normally only good for warm climate location. Elsbette made a single tank system with modified injectors and other goodies. It is simpler but it may be frowned upon by others.
4) Add an after glow circuit to assist complete combustion at cold start.
There are successful single tank conversion with simple in-line heater and there are sophisticated 2 tanks system. The sky is the limit.
The bottom line is filtering and filtering WVO, and de-watering whatever you do.
BTW: PP is not a very good forum for alternative fuel discussion.
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