Hi,
As stated above, you need to get the permission for storage, transfer and disposal of Used Oil from Hazardous Waste wing of local Pollution Control Board.
Used Oil should be stored in a sealed drum placed on impervious floor under covered shed. Usually Used Oil is been sent to the refinery for recycling purpose but the agency should be authorized from the PCB.
No hazardous waste can be stored for 90 days.
regards
Mukesh