Hi Andriani: The lubricant for R-134a is the POE, the issue is that it cannot be completed on the old oil. You have to drain it completely, and do a couple of rinses with POE, and empty again. Then just place the right amount for the motocompressor. Remember that you cannot leave the POE oil uncovered for more than 10 minutes, it takes humidity from the environment. Luck, comment your results.