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Old 07-23-2021, 06:28 PM
Join Date: Aug 2018
Location: Central FL
Posts: 100
Mike1261 is on a distinguished road
How much PAG 46 On AC compressor/drier change?

My AC compressor crapped out. I have a new Behr compressor coming. I have a vacuum pump. I have a new dessicant for the drier in the condenser unit. I've got R134a. I've got PAG46 and I've got 4-way AC guages.

I think my parts list is complete to get this AC swap done. But I have no idea how much PAG46 I'm supposed to use!

I know I'm supposed to measure how much oil comes out of the old compressor and put that amount in the new one.

But I also know there's some in the receiver drier that I'm replacing. I can't find how much to add to compensate for new dessicant in the drier?

Also, I plan to pull vacuum on the AC system to do a proper refill especially given how humid Florida is right now. Does pulling vacuum suck any oil out of the system I need to compensate for as well?

I haven't done an AC system since my Camaro's R134a conversion back in 2001, so I don't really remember anything about it and learning from scratch.

Thanks! :-)
2006 BMW X5, 3.0i - 133,000 miles
2003 Ford Mustang GT - because having Two cars that keep dying seemed more exciting.
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Old 07-23-2021, 06:56 PM
Join Date: Jun 2014
Location: Omaha, NE
Posts: 1,506
cn90 is on a distinguished road
I think the E53 X5 "may" be a bit more than E39 5-series.

I replaced the AC compressor on my 1998 528i at 160K miles and wrote a DIY here...

DIY: 1998 BMW 528i 160K Replacing AC Compressor

1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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Old 07-23-2021, 07:00 PM
Join Date: Jun 2014
Location: Omaha, NE
Posts: 1,506
cn90 is on a distinguished road
- The vacuuming process does not remove much PAG oil.
Probably nothing.

- Most of the PAG oil is in the compressor anyway.
Some compressor comes prefilled and some leaked PAG oil during shipment.

- Best is to drain all the PAG oil out of the new compressor and fill it using info in this thread...

1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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Old 07-23-2021, 08:55 PM
Join Date: Jan 2013
Location: TX
Posts: 74
txyaloo is on a distinguished road
It's odd that AllData also doesn't specify the type/quantity of compressor oil.

You do need 430-450g of R134a.
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