I am personally doing this in my Lister GM-90 clone. Have about 65 hours operation so far, it runs as good today as the first day I started it up, but admittedly this isn't much operating time. I don't need to keep the oil that hot, room temp, 70 to 90F is fine. One key is allowing the oil to settle out undisturbed for a couple months, and another is keeping your fuel tank in a warm spot. I have 4000 gallons of storage out of doors, and a 300 gallon "using" tank inside where the gensets keep the tank at a nice reasonable temp. Then I run the fuel line alongside the exhaust pipe copper tubing heat exchanger wrap, for a few feet, which adds a few degrees, not as much as you might think. Just need to start the thing on starter fluid or heat the injector with a torch, or start it on normal diesel, then it goes and goes and goes. Runs at least as strong as with diesel too. I have learned so much in this endeavor, I feel like I should write a book :-). And it is nice to bea ble to share here, and learn some too. Cheers
P.S. Still looking for a good electric starter design for my Listeroid. Hmm, maybe an air starter...
Bill K