Oil

Oil is a liquid which has been existed since first Powder Toy. It is element number 3.

Properties
Oil is a flammable liquid which is dark yellow in color. It can evaporate into also-flammable Gas at around (60 C: 333 K). Another way of oil turning into gas is vacuum (negative pressure).

Uses
Oil is used to represent a flammable liquid, even though it's outnumbered by Diesel and Nitroglycerin.

Oil is created when Diesel comes in contact with Neutrons.