Using the original formula of 75% ether to 25% oil was done way back before they had fancy additives in the oil. But the mineral oil was important for moderating the harsh combustion effects of all of that ether too.

Using a normal model diesel engine fuel formula should work OK though. I have been using Davis Diesel fuel to good effect in mine. I could probably get a little more power with the original mix formula though. But if the compression is low, it may not work.

You might need to go with a heavier grade of oil to help seal up the piston to cylinder better.