K&B Speed Fuel (~60% vitamin N) was said to have "epoxidized safflower oil for lube. I wasn't all that impressed with the lubricity of the fuel, and started mixing my own using Ucon oil. This was much better, apparently, because the engine wouldn't seize on a lean run until the piston had a hole in it and the cylinder liner had turned a pretty blue...still with a nice smooth bore.
One of the questions that has always nagged me was whether the glowplug seal blowing was what caused the burndown or whether the lean run caused the glowplug seal to give up the ghost and head for cooler climates. I always got my best speeds with K&B glowplugs and had most the bad stuff happen with Fireball glowplugs.
PS: Hempseed oil might be the cat's PJ's, and I'd guess that it's legal in my State.