An improved CO2-oil minimum miscibility pressure (MMP) correlation has been successfully developed to more accurately determine the CO2-oil MMP for a wide range of live and dead crude oils. Experimentally, slim-tube tests have been conducted to determine the CO2-oil MMPs for four crude oil samples with high molecular weights of C7+ fraction. Theoretically, the newly developed CO2-oil MMP correlation is originated from a CO2-oil MMP database from the literature that covers 51 CO2-oil MMP data for various live and dead oil samples, especially those with high C7+ molecular weights. The new CO2-oil M.MP correlation is expressed as a function of reservoir temperature, C7+ molecular weight, and mole fraction ratio of volatile components (N-2 and CH4) to intermediate components (CO2, H2S, and C-2-C-6). Compared to nine commonly used CO2-oil MMP correlations in the literature, it is found that the new CO2-oil MMP correlation provides the best reproduction of the literature CO2-oil MMP data with a percentage average absolute deviation (% AAD) of 8.08% and a percentage maximum absolute deviation (% MAD) of 22.99%, respectively. To further examine its predictive capability, the new CO2-oil MMP correlation is then validated with the four experimentally measured CO2-oil MMPs in this study. The newly developed CO2-oil MMP correlation leads to the best prediction accuracy of the four measured CO2-oil MMPs with a % AAD of 4.18% and a % MAD of 7.01%, respectively.