Unsaturated vege oil may be better for your insides, but not your car. Unlike paraffins, PAO's, esters, and any other base stock, if you heat pure unsaturated vegetable oil especially in the presence of air, it polymerizes to a solid. As a motor oil, it asks too much of the additives. Try this: pour a little of what ever you can spare from your oil shrine in a paper cup, and some of your wife's cooking oil in another. Dip your soldering iron in the motor oil and pull it out and turn it on. The oil will boil off giving an oily smell. Then the vege oil. It will give off a burned smell, and leave a dark residue on the soldering iron.
OK, it is a severe test, and I skewed it, using Pennzoil and cheap cooking oil from Aldi's. Do you think Mazola and whatever cheap SF you found would work differently?
