Whoever told you that PAG wasn't right for R134a doesn't know very much about A/C systems, as all major manufacturers recommend only PAG oil. & if you can afford buying from MB dealer, PAG is all that you will get with STAR & factory part number.

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