Extensive modifications in both physical facilities and experimental equipment have extended capabilities in the area of low flow rate and gravity stable displacements. Consolidated core floods may be made now at high water saturations in 6-ft Berea sandstone cores to permit the study of CO/sub 2/ injection as a tertiary recovery process. All displacements during the period have involved reconstituted crude from the Brookhaven Field (Mississippi). These consisted of 2 runs in 6-ft Berea cores and 15 runs in 20-ft sand packs. Based upon these data, it is concluded that (1) a second (presumed liquid) phase develops at 109 F which consists of CO/sub 2/ and C17-C28 hydrocarbons and is not miscibly displaced, (2) CO/sub 2/ can bank up discontinuous residual oil in a watered-out system, (3) an increase in displacement temperature causes a significant increase in minimum miscibility pressure, and (4) definitive interpretation of compositional data can be made only when such data are taken during gravity stable displacements.