Thanks, I'm aware of the Sig castor. No reflection on Sig, as I'm sure they're offering it at the best price they can afford. . .but it is very expensive relative to what AA castor actually costs in bulk, which is my point. When just a few buyers have to bear the cost of packaging and marketing, the price goes up. In the meantime, Shell 20W50 seems to be doing a fine job in my homebrew at the cost of $1.59 a quart. I do take extra care to flush my engine due to the corrosion potential of the MEPK I'm using as ignition enhancer, but I have a suspicion that the 20W50's additives are trapping a good part of the combustion by-product acids and spitting them out along with the rest of the grime. The engine's innards look amazingly clean.

Having said all of that, I'm going to see if the 5 gallon cans of castor are around. There may be a cost benefit when the stuff is packaged this way.

From my locale, the price point for homebrew is the lube, not the ether. Eleven cans of starting fluid amount to roughly 1 gallon. . .at $2.00 a can. Even if I could get someone to sell me a gallon of ether, it won't be for $22.00!

Casual readers should take note here: I'm going on the reports of people who claim that they have run the kind of fuel setup I'm using. Your results, and mine for all I know, may vary. My advice is to buy commercial fuel if you're not up to a little adventure. I do promise to report here if my engine hurls chunks or the cat goes blind.