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This paper reports the effect of composite oil on the breakdown voltage. The composite oil is combined of palm oil and diala-b oil with various ratios. The breakdown voltage testing scheme is carried out with two variations test, the first without treatment and the second using treatment (boiling). Tests are carried out to obtain a breakdown voltage that is in accordance with the minimum standards of liquid insulators. From the test results, the breakdown voltage of the sample before going through the treatment process is very low, between 12-18.8 kV / 2.5. After the treatment process, there is a good breakdown voltage test, which is between 30-35 kV / 2.5 mm. The breakdown voltage test results in the treatment sample are higher as the concentration of the mixture from the diala-b increases. The average increase is 0.05 kV / 1% mixed diala-b. Palm oil samples have a higher water content than diala-b, which is 0.10%, while the diala-b is 0.08%. The effect of water content on the breakdown voltage average of 0.01 kV / 0.02% moisture content. Acidity (pH) in the test sample between 5.32 - 5.58. The 100% diala-b oil sample is 5.32 and 100% palm oil is 5.58. From the pH level, it is known that the higher the PH, the lower the breakdown voltage in the sample oil. The effect of an increase in pH on decreasing breakdown voltage is an average of 0.1 / 0.192 kV. The results show that the water content and acidity affect the oil breakdown voltage. The breakdown voltage values of all oil mixture samples that have undergone a treatment process have met the IEC standard No.56 1991s with results classified as above the standard (standard >= 30kV / 2.5mm).