I finally managed to slog my way through all 45 pages of this thread. All things considered, Slope-Soarer's mod-olive/mineral mix seems to promise the performance I'm looking for since I also practice small engine powered soaring. For those in North America, I discovered that Sam's club has a house brand extra virgin olive oil in a 3 liter jug for less than $18.00 while Walmart has 6 oz bottles of glycerine (in the first aid section of the pharmacy) for less than $3.00. I couldn't come up with a semi-synthetic 10W-40 for diesels, but Shell's Rotella 10W-40 (for diesels) looked good enough to me. Seeing as how Chevy43's diesel oil works after rumbling around in the innards of a road vehicle's engine, I'm not concerned about the Rotella.

About 2 years ago, someone on one of the diesel forums warned me that my dieselized OS .40 fp would break down if I used motor oil as lube instead of the sacred castor oil. I took Jen's advice instead and so, about a gallon and a half later, this engine (that was well used when I converted it) is still going strong. I will admit to needing to shovel out the carbon now and then, but I'm guessing that olive oil in the mix will cure that problem.

Thanks to all of you out there who ignored conventional wisdom and experimented to find out what actually worked.