Oil

Ammo for the flamethrower. exclusively found in explosive obstacles. Interacting with the flamethrower equipped beside an explosive obstacle will damage the obstacle to 1 HP and grant 1 oil. It will also remove the explosive property from the obstacle (E.G consumed barrels will no longer explode, but are still destructible and reflect bullets. consumed explosive obstacles will not smoke. 
Oil lasts 3 second in firing duration (0.033 oil consumed every 0.1 seconds).
it can be obtained from silos.