Oil does not burn when it is a liquid. Oil will not burn unless it is preheated to 140 degrees and is non-carcinogenic. Gas can be damaging and dangerous. Whether it’s a gas leak in the house or a rupture in a gas line on the street, explosions and deadly accidents can occur. If there’s a malfunction with oil heating, there are early warning signs like smoke or soot that are more obvious and give time to react, unlike the odorless fumes. of natural gas.