The 'best' system is the one that makes no compromises, I haven't seen one yet that meets that. The greatest hurdle to me getting one for my diesel is the packaging. The spare tire well is frequently given to a second fuel tank. I have problems in giving up the security of a spare tire or of giving up storage space to relocate the spare.
The routing of the fuel lines, second filter, hot water lines, "T" fittings, six way valves, temperature monitoring gauges, and on and on can be integrated into the existing systems to work without leaking and also be aesthetically pleasant, but I haven't seen one done that way yet. They all look to be cobbled together from bits scrounged from cast off hardware left over from other failed projects.
Adding an SVO/WVO kit is a great way to depreciate the value of a diesel.
The neatest, least troublesome, SVO/WVO system I've seen is the Elsbett single tank system, but it is far more costly than the home-made (whether installed at your or some professional's "home") kits.
It's my opinion that the same funds spent on a SVO/WVO vehicle kit would be better spent on a system to convert the VO into biodiesel.
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