A/C DIY. How much oil to add?
 

I'm planning to DIY A/C in my 2008 GL550. It didn't blow cold in last summer I had to add 2 cans of R134 to get it work. But it just last 1 week then back to no cold. End of the summer I was under the truck to check something else and found a big area wet around A/C compressor and tubes. Looks like a compressor leak.

My questions is : After o ring replacing and putting back compressor, How much A/C oil should I add back to the system? Someone has done this before please help.

Everything you wanted to know about A/C Service. I've used it on a couple BMW's and a Chevy successfully:

https://drive.google.com/file/d/0B0f...it?usp=sharing