ArnoldBraker

I am replacing some AC stuff on my car and got new o-rings. Am I supposed to oil them or something? If so what kind of oil, just regular engine oil or what?. Also, I'm getting new injectors from summit next week. Is the proccess the same for oiling the o-rings that come with those? Thanks for the help. ~Arnold

custman87T/A

You should put a drop of oil on the o-rings for the A/C but isn't totally necessary. You use the oil you are going to use in the A/C system for the o-rings either mineral for R-12 or PAG or ESTER for 134A.
On the injector o-rings use regular motor oil, just lightly rub some oil on them to help them slip into position to reduce the possibility of tearing them.

nativ

dont use the ester oil on o rings it is my understanding that this oil eats up the o rings. just use the mineral oil that is used with r12. I just retrofitted my car to 134 and all the advice i got was not to use ester on o rings. I didnt want to buy a whole bottle of oil just for o rings so i put old o rings in baggy and took them to store to match up. while there i went to ac section opened bottle of r12 oil and poured a little bit in the bag, had more than enough to lube the 4 rings. compressor seals needed no lube.

Vader

Arnold,

Strange as it may seem, you can use clean, pure polyethylene glycol antifreeze (PEG) concentrate to lubricate seals for use in a refrigeration system. The glycol is not incompatible with the rubbers, and will not contaminate the oil or filter/drier units, and will not congeal and block expansion valves or oriface tubes (capilaries).

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Later,
Vader
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ArnoldBraker

Thanks for the advice guys. Hopefully my AC will be fully functioning by this evening ~Arnold