The Project

History of the project.

A catadore

Waste vegetable oil

Filtration system


In August 2010, the Grease Project ran a workshop in CRUMA, a well-established São Paulo cooperative, that taught catadores: 1.) a simple, low-tech method for converting diesel engines to run on WVO; 2.) how to filter WVO; and 3.) the best modes of WVO collection. In addition to teaching catadores the method of conversion by using the cooperatives’ trucks as demonstration vehicles, work completed during the course of the workshop nearly eliminated fuel costs for the waste picker union’s network of twenty co-ops.