Does A/C need oil with every recharge?

[TazMan]

I have a 92 Grand Prix that looks like it was converted to 134a. When I bought the car last year the A/C supposedly worked but the car had been sitting for about a year and it needed to be charged. I figured I'd charge it and see how long it held. When I bought the freon, I notice they also sold oils that you put in through the freon hose, but I didn't bother to look into it since it was the end of the summer and I didn't think the freon would hold anyway. Well it's a year later and the air is still ice cold, so my question is, do I need to add that oil, and if so, what kind of oil for an r12 system converted to 134a? Thanks for reading everyone.

[86euro]

It should be fine, unless the compressor is noisy.

[TazMan]

I haven't noticed any noise but I haven't actually checked for it either. I'll have to listen for it tomorrow morning. Thanxs again!

[tractorman]

oil

Oil doesn't need to be added generally unless the system has been converted and/or flushed. Assuming that some R134A compatible oil was added when that system was converted, there's no reason to add oil now.

[bszopi]

You can also get R134a with oil in the mix. So when you charge the system, it will add oil as well.