A light-crude-oil distillation residue mixed with used oils was cracked, 0.6 mL/min, at 510-550degreesC/1 atm. to yield a liquid product which was distilled to yield a gasoline fraction (< 180degreesC), a diesel oil fraction (180-370degreesC), and a residue (> 370degreesC). At 510degreesC, the liquid product was 97% (vs. the 77% at 550degreesC) and the gasoline and diesel oil (cetane no. 48) fractions were 3 and 46%, resp. The diesel oil was refined under N-2 on a halloysite bed, 10:1 w/w, at 250, 300 and 350degreesC. Fe, Pb, and Zn were removed in 45% (300degreesC), 75% (300degreesC), and 85% (250degreesC), resp.