(1) Whether the quality of diesel is regulated in South Africa; if not, why not; if so, what are the relevant details; (2) whether diesel vehicles that are produced for the domestic market are different to those produced for the export market; if so, what are the relevant details; (3) whether her department intends instituting any policies to ensure that the quality of the diesel is improved; if not, why not; if so, what are the relevant details?