I thought this thread would get more traction than it did, this is a well researched and documented subject. I've owned a variety of diesels, VW, Mercedes, Ford, GM, Dodge, I spent a lot of time looking into biodiesel and wvo setups. Theres hours of stuff on YouTube and countless other sites about it, the biggest thing I found was not many people talk about how it works in -30... because it doesn't. The reason temperature is a issue is the fact that it affects viscosity and that's the secret to success with any alternative fuel. You can use almost any oil imaginable if you can get the viscosity correct. If it's too thick you'll wreck the pump and be out hunderds or thousands of dollars, depending on the vehicle. Heat is the simplest method of managing viscosity, most systems use the vehicles cooling system to heat the oil as it travels to the engine. This is easily done with jacketed piping, heating elements in the tank, and good insulation. The switch between fuels is easily done with a couple valves inside the cab, proper temperature probes are key to pump survival as well as cool down periods to flush any of the oil out of the fuel system before shutdown. This can all be done electronically of course but it adds thousands to your build costs.
If its strictly about cost savings you're better off to buy a older four cylinder or smaller import and do all the maintenance yourself.
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