You guys are going to laugh at me, but the following is true.
Can one contains straight MMO - I love the stuff.
Can two contains used motor oil - it's free and gate hinges, old car door hinges and certain tractor parts love it.
Can three contains used veggie oil that I save from when we fry fish and chicken at a family gathering. Over time I have discovered that it is a wonderful lubricant for certain applications. I can squirt it on my disc bearings and it will last for months and not wash off in the rain whereas used motor oil will be gone after the first rain. It also does an excellent job of keeping my disc blades from rusting for the same reason. I also use it on an ancient spreader to keep the gears from rusting and keeps every thing lubed very nicely. We have enough fish fries at family gatherings that I usually have between five and ten gallons on hand at any given time. I filter it through an old shirt into a five gallon bucket and it's as good as new.