Back in the early seventies when the government banned leaded fuel, there were some problems with the rubber compound used on carburator needles and also problems with the plastic floats absorbing fuel, it took a couple of years for everything to get refit with updated parts(different compounds of plastic and rubber) , since then their haven't been any problems. The auto manufacturers had enough warning to change to compatable materials for gasohol, but a pure methanol fuel system takes a complete refit with compatable materials.
Cummins official policy is that the new ultra low sulfer diesel is compatable with their fuel systems, and it should be, afterall europe has been using ultra low sulfer fuel for several years and the refineries add a lubricity addative of some kind to meet the enginme manufacturers spec. That still doesn't address WVO but I imagine that any veggie oil (no animal fats & acids) will cause no harm, and if it did it would attack the rubber components(hoses) and that can be cured by changing to a hose made of something that is compatable,IE food grade synthetics.
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