The limited availability of fossil fuels and the current issue of global warming has made biodiesel an alternative The first section in your paper fuel option. Biodiesel, which is processed through the transesterification reaction in its use has been approved as a commercial fuel with a low blending ratio. However, it is possible to use it with a high ratio. Blending biodiesel and diesel fuel with a high ratio, of course, many considerations must be agreed upon regarding the quality of the product. In this study, the quality of the biodiesel-diesel blending was evaluated. Characterization of the blending fuel properties with improvement was carried out to evaluate the characteristics of the fuel blending and to indicate the maximum blending ratio that is suitable for use and does not harm the environment or its users. Diesel fuel (B0) with a cetane number of 48 and a cetane number of 51 is blended with FAME (B100) from a ratio of 10% FAME and 90% diesel (B10) to 90% biodiesel and 10% diesel (B90). Characteristics such as viscosity, density, FBT, Cleanliness, total contaminants, and CFPP were tested according to ASTM and ISO standards. The results showed an increase in the value of viscosity and density as the ratio increased but still met the ASTM D7467 standard of 0.855 mg/m3 in the B90 and the highest viscosity was 4.9 mm2/sec in the B70. The results of the FBT test, total contaminant, cleanliness, and CFPP the highest on B90 for all fuels.