A waste oil container includes an oil catch pan for collecting oil that leaks from a parked vehicle and a leash for attaching the oil catch pan to the vehicle. The oil catch pan includes a bottom, a surrounding wall structure, and an open top. The oil catch pan is integrally formed of a crush-resistant material that is self-supporting, is sufficiently flexible to collapse without breaking when crushing force is applied, and is sufficiently resilient to return to an original condition when the crushing force is removed. The oil catch pan is sized to fit underneath a parked vehicle to collect oil leaking from the vehicle and can be stored within the vehicle without unleashing the oil catch pan when the vehicle is being driven.