What possible use could Josh have for all that old oil? 알고 보니 조쉬는 가정용 화학약품을 사용해 그 기름을 디젤 연료로 바꾸고 있었습니다. Here is the diesel that can actually be used straight into an engine, he says, pointing to the amber liquid that has separated from the fats in a storage jug.