I just drove my first 40 miles on scavenged petro fluid in my NA IDI, just a great mix of 2-stroke, gear oil, motor oil, lamp oil, Coleman Fuel, jack oil, some ATF, and a bit of diesel. It was all fresh stuff that was in an old barn, all of it was over 10 years old,most around 20 or more, the Penzoil was in cans you had to open with a can opener. Just thinned it till it was a bit thicker than diesel. Smokes less than on diesel once its warm, haven't towed anything yet, just drove to work when it was raining and didn't want to take the motorcycle.