Since both MBUSA (DC) & Nippendenso recommend only PAG oil why go elsewhere?? Most lubes that try to do more than 1 job won't do either job well. There are even various weights of PAG oil for different brands of compressors. ISO 46 is the correct weight for Nippendenso & ISO 150 is for GM compressors. As Steve has said start fresh & use correct weight PAG oil for R134a.

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MERCEDES BENZ MASTER GUILD TECHNICIAN (6 TIMES)
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V