T The Enhanced Oil Recovery (EOR) method, utilizing polymer injection to augment the viscosity of injection water, has gained prominence in EOR for its practicality and the potential for enhanced oil recovery compared to traditional water injection methods. This particular research, conducted at Trisakti University\'s EOR Laboratory, represents a progression from prior studies, introducing adjustments in polymer concentrations from 1,000 ppm, 3,000 ppm, and 5,000 ppm to 500 ppm, 600 ppm, and 700 ppm, all while maintaining a salinity level of 7,000 ppm. The methodology involved a systematic collection of both experimental and analytical data, with subsequent calculations performed after experimental measurements using calibrated laboratory equipment. Primary data collection involved meticulous and direct observations of the research subject. The research had comprehensive objectives, including a detailed evaluation of introducing Cellulose Polymer (PC) and Partially Hydrolyzed Polyacrylamide (PHPA) with Tween-80 to enhance formation water viscosity. The study also analyzed concentration variations and assessed temperature changes. The primary focus was to identify the most effective polymer variation correlated with oil recovery (recovery factor) at a consistent salinity of 7,000 ppm. The notable findings revealed that the addition of Tween-80 to PC polymer at a concentration of 700 ppm with a salinity of 7,000 ppm outperformed other concentrations. Under these specific conditions, the incorporation of PC polymer with Tween-80 yielded optimal viscosity, measuring at 1.71 cp. The injection tests of PC polymer with Tween-80 additive at a concentration of 700 ppm and a salinity of 7,000 ppm were meticulously conducted using representative rock samples, namely cxl-2 and cxly-3. Impressively, at a temperature of 60 °C with PC polymer and Tween-80, a concentration of 700 ppm at a salinity of 7,000 ppm resulted in an impressive recovery factor of 10.56%. However, at a higher temperature of 80 °C, the recovery factor remained noteworthy at 9.44%, indicating a discernible decline in the efficiency of polymer injection with the rise in temperature.