Can we do more with used oil?

[Nyogtha]

Using recycled motor oil on its own or blended with other refined products requires no re-refining. It's still resource conserving.

 

[oil pan 4]

Someone told me that we can’t turn used oil into gasoline. I never got a answer though as to why

It can it just doesn't appear to be worth it. Supposedly the additives cause problems inside a refinery if too much used motor oil is dumped in.
It would take lots of hydrocracking.
Normally hydrocracking is used on hydrocarbon molecules to shorten hydrocarbons that are a little too long to be gasoline and too short to be used as diesel or jet fuel this hydrocarbon dead zone is the "gasoil". When the hydrocarbons are hydrocracked it chips the ends off the HC chain turning them into ethane, propane and such most likely.
So hydrocracking motor oil into gasoline would be a really complicated way to take methane, turn it into hydrogen and make gasoline and propane, ethane out of it.....
Better off safetykleening the oil, just burning it or adding a tiny bit to crude oil and increasing your heavyweight oil fractions.

 

[53' Stude]

Hopefully someday the USA will refine more motor oil like Europe does.

 

[zzyzzx]

It's sometimes used in electric power plants. Normally older smaller plants that aren't used much. Used motor oil is way better than what they are designed to use, which is https://en.wikipedia.org/wiki/Heavy_fuel_oil or something like it.