Quote Originally Posted by cmarlow View Post
What I was told was crude oil, but I think they meant any sort of diesel or vegetable oil. Wikipedia says the Ursus 45 tractor was an unlicensed Polish copy of the German Lanz D 9506 Bulldog tractor.
Yeah, I was thinking fuel oil because of its availability then and the 2 stroke. What ever it was it wasn't burning too clean...they were in a cloud in only a few minutes.