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the POE oils are VERY VERY VERY hygroscopic. they do not release moisture at all... even down to 100microns! (never ever gonna get that low a vacuum in a car system!) so you HAVE HAVE HAVE to put in a new drier with the POE oils. DO NOT PUT DRIER IN SYSTEM until EVERYTHING else is done. you want that drier open the minimum amount of time before you start the vacuum pump. and it's NOT a good idea to put the oil in the drier.
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I know this is a very old thread but I need to add oil to my compressor and was wondering why you should NOT add the oil to the receiver dryer? Won't the oil make it to the receiver dryer when the compressor is running?

Dieselgiant adds to receiver dryer but if there's a better option, please let me know.

I'm thinking about getting a big syringe and shooting the oil through the top (low side) line after removing the schrader valve.

I don't think the compressor will hold 8oz of oil. I'm sure some would spill out when I'm re-stalling the 3 bolts.

Also, any recommendations on what type of 500-525 mineral oil to buy?
FJC makes some Automobile Air Conditioning Parts of Tucson Arizona, Century Auto Air, AC Parts, AC Service and Hoses, centuryautoair.com

Thanks.

pete