Oil and oil products do not come from fossils. Fossils don't burn.
Yeah, I know. The idiot school you went to taught that oil comes from dinosaurs. It's wrong. Oil is actually a renewable energy source. The Germans and the Russians showed why.
During WW2, the world was putting to the screws to Germany to try to shut down it's war machine, including blocking the import of oil, needed to make fuel for their tanks and other military equipment. So the Germans took their chemical industry (the best in the world at the time) and had a go at making their own oil synthetically. They succeeded. It's called the Fischer-Tropsche process. All you do is take hydrogen, carbon dioxide or carbon monoxide, put it under heat and pressure in the presence of an iron catalyst. Out comes light sweet crude, and methane...hydrocarbons.
These are exactly the conditions found underground. The Earth is a giant Fischer-Tropsche reactor. If you drill deep enough, you WILL find oil. Oil comes closest to the surface at tectonic plate edges, particular where spreading or shearing action is taking place: The Mideast; the north slopes of Alaska; the North Sea; the Caribbean and all the way up into Texas and Pennsylvania; off the shores of California and down into Baja. All of these are on plate edges where shearing or spreading action is taking place.
The Russians once drilled a hole right through the Antarctic ice sheet. They developed the technology to drill a hole deeper than anyone had ever done before. They used that technology to drill in the middle of Siberia, away from any plate edge. Sure enough, they found oil.
Methane is also typically found along with the oil. Methane can also come from bacteria or the action of sunlight on an atmosphere containing hydrogen and carbon dioxide. It's pretty easy to make. Just shove energy into making this chemical bond, and you can release it as fuel.
This explains why, for example, that you can pump a Texas oil well dry, cap it, and it's full again after a bit of time has past. It is NOT seeping in from other wells, they were also pumped dry.
The Earth is continuously making oil. There is enough and to spare. The ONLY thing making oil products expensive is government regulations and taxes.