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The viscosity of the oil is a problem for the injectors. At cold temperatures, it's an insoluble problem. Once heated up, it's minimal, but still an issue for the pumps and injectors themselves, which can and do fail.
The cure, obviously, is conversion to biodiesel, but I've heard tell of issues with esters and valve recession. And you still have viscosity issues, deposit issues,m pump and injector failure, oil dilution (still!) and etcetera. The worst being the diesel particulate filter issue, which can cause engines to go bye-bye. Cummins is supposed to be one of the few manufacturers who uses a separate injector for DPF, which means it should be more friendly to biodiesel than most.
The best way to go straight veggie oil is to use a prehistoric mechanical pump system with pre-chamber injector nozzles, and check the oil regularly to detect dilution.
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