Only black substance made from decayed plant matter over millions of years. When extracted raw and it's crude form it can then be process and refined into refined oil. That is what your vehicles and Machinery use as
lubricant. There are many different types of oil and weights. And is most commonly
associated with
countries such as the USA the UK and Saudi Arabia.
"It makes cars go" (Bill Wurtz)
Hey man can you run down to the store and get some oil.
Sure man
what you need?
Some 15-40 I need it for the
lawn mower.
All right I'll be right on it.
OR
"The
United States has just recently obtained a beneficial oil contract with Saudi Arabia."