AC oil? AC 134?

[FineOlBenz]

Easy questions I hope. How much PAG oil and how much R134? I'm replacing the compressor and filter drier with a Napa (Made in China model drier) as the Napa warantee was 2 years on the compressor. I had to buy a new drier with a current receipt. My original Mercedes drier (still in the box) was not good enough with a 12 year old receipt. Just *****ing here. Back to the real question How much oil and where, how much 134 and I know where ?

From what I understand it takes less 134 than R 12. Two cans worked good in my 240, I'd just like the 300D to work better.