Does old salad oil from the kitchen count?
The 4BD1 doesn't seem to care much.
Power Service in the summertime, garage in the winter.
I went to Moab mid-October last year and had lousy weather on the way out.
Only made it to Silverthorn where it was going to be 10F overnight.
Started feeding it the Howes stuff in Kansas and didn't have any gelling issues ... no idea if it's any good long term, but it did what I wanted that night.