Can you mix R-134a with synthetic R-134a?

Yes, R-134a can be mixed with synthetic R-134a, as both products are essentially the same refrigerant (tetrafluoroethane) and have similar chemical properties. However, it's important to ensure that the synthetic version is compatible with the system and that the oil used is also suitable for R-134a. Mixing different refrigerants or oils can lead to performance issues or damage to the system. Always consult manufacturer specifications before mixing refrigerants.