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."