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Mix PAG 100 with PAG 150?

nyc951 on Thu August 05, 2010 9:25 AM User is offline

Year: 1998
Make: BMW
Model: 328i
Engine Size: 2.8
Refrigerant Type: 134a

Hi there,

My car uses PAG 100 according to the NAPA reference chart I found on this site. I want to add a couple of ounces of oil back into the a/c system, but I only have PAG 150 on hand. Will it be ok to mix the two viscosities since they are both PAG oils?

Thanks in advance.

'98 328i

TRB on Thu August 05, 2010 9:31 AM User is offlineView users profile

Best to not mix oils even if they are both a PAG. Will it hurt if you do?? Probably not. Could lower the life of the compressor.


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mk378 on Thu August 05, 2010 11:09 AM User is offline

Also PAG absorbs water readily, which destroys it's lubricating properties, so you should not use any from an old bottle that has been opened and sitting around for a while. Buy some fresh PAG 100.

nyc951 on Thu August 12, 2010 7:57 PM User is offline

Hi guys:

Today was ~85 degrees out with low humidity. The car was parked and I checked the pressures at 2000 RPM:

Low - ~30 to 33 psi
High - 300 to 320 psi

That High reading seems too high to me. What are your thoughts? When I started driving the car the vent temps got around 40 degrees, so it's working fine. Do I need to be concerned with the pressure readings?

Thank you

'98 328i

nyc951 on Mon August 16, 2010 7:22 PM User is offline

Bump for responses to my question, please
I want to know if the high side pressure is too high and if I should have the system recovered and recharged.

'98 328i

iceman2555 on Mon August 16, 2010 8:28 PM User is offlineView users profile

At the stated RPM...the ambient temp...not sure about 'low' humidity....the pressures and temps are acceptable.

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