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Topping up AC refrigerant, what about PAG oil?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Topping up AC refrigerant, what about PAG oil?

Post by LOB » Thu Jun 04, 2020 3:08 am

Let's say I've lost 30% R134a during the last 5 years and I topp up the system with new propane/butane mixture. Do I also need to top up with PAG-oil?

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Re: Topping up AC refrigerant, what about PAG oil?

Post by erikv11 » Thu Jun 04, 2020 7:17 am

Unless you have a breach in the system where you can see oil leaked out, you do not want to add any oil when topping up. Recharge with straight R134a.
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'95 854 T5-R, Motronic 4.4, 185k
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Re: Topping up AC refrigerant, what about PAG oil?

Post by LOB » Fri Jun 05, 2020 5:25 am

Thanks! I dont think R134a is available from retailers in Sweden. You can however buy the propane/butane mixture.

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