I find that a little hard to believe. Yes, it's a petroleum product but I've never found it to be oily in the least. I use it a lot and I've never found it to leave an oily residue. Pretty much evaporates cleanly.
Mineral spirits on the other hand does appear to have an oil component and will leave a film.
and yet it is so, much of the flame resistance to the wind, over to the shape of the fireplace of lighter, depends own oil present in the fuel percentage.
However, I have 98 yo-yo (98 bearings) as another 23-24 bearings of reserve and more than 9 years I clean them with this fuel ... are all still in perfect working order!