When you put oil into dirt it is slowly eaten by hydrocarbonoclastic bacteria and fungi. This process takes a long time, years for a typical backyard. This na

When you put oil into dirt it is slowly eaten by hydrocarbonoclastic bacteria and fungi. This process takes a long time, years for a typical backyard. This natural process can cope with small amounts of oil like a drip here and there but if you dump an entire car's worth you are gonna have a problem. If the dirt becomes saturated with oil it could wash into your neighbor's yard in the next rain storm. https://microbewiki.kenyon.edu/index.php/Oil-Eating_Bacteria:_A_Tool_for_Bioremediation https://microbewiki.kenyon.edu/index.php/Oil-Eating_Bacteria...