adding oil after top off?

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tdawg46
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Joined: Fri Aug 21, 2020 1:53 pm

adding oil after top off?

Postby tdawg46 » Fri Aug 21, 2020 2:04 pm

I added 10 oz of r134a to the system after over 15 yrs of use. Do I need to add oil also? Thanks
Al9
Posts: 240
Joined: Tue Mar 10, 2020 3:26 am
Location: Southern Europe

Re: adding oil after top off?

Postby Al9 » Sat Aug 22, 2020 2:35 am

Oil is to be added only as the same amount recovered together with the refrigerant, or as the FSM specified amount when replacing a part and not doing a flush.

On a 15 years system, a wise thing would be to do a full system flush and to start with a fresh system oil charge amount. No way to know how much leaked out or how too much was added.

Anything else, it becomes a matter of guesswork and the risk of overcharging or undercharging is simply too high, so i won't tell you any specific amount.
tdawg46
Posts: 2
Joined: Fri Aug 21, 2020 1:53 pm

Re: adding oil after top off?

Postby tdawg46 » Sat Aug 22, 2020 9:27 am

A19, thanks for your response. Would it be normal to leak that amount over 15 yrs? 98 Jeep xj
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Cusser
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Re: adding oil after top off?

Postby Cusser » Sat Aug 22, 2020 10:40 am

tdawg46 wrote:I added 10 oz of r134a to the system after over 15 yrs of use.


tdawg46 wrote:Would it be normal to leak that amount over 15 yrs? 98 Jeep xj


Not uncommon at all. Auto AC systems are designed to leak a tiny amount out of the compressor seal, to keep the shaft lubricated.

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