The M1 Abrams is a modern American main battle tank.
When the devs accidentally add oil to the game.
Extract the abrams.vox file in the LEVEL folder you want to use it in (Steam/Steamapps/common/Teardown/create/LEVEL).
Open the abrams.xml file and copy its contents to the LEVEL.xml file, below the last </vehicle> tag (Steam/Steamapps/common/Teardown/LEVEL.xml).
Save the edited LEVEL.xml file.