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The oil is added seperately. Given that you are replacing the condenser, and if you are smart you will replace the filter/drier assembly, you will want to add at least a few ounces of oil, and this is special oil for AC systems, not like Penzoil or something.
The system will have to be drawn down into vacuum before adding the R134, so unless you have an AC evacuation machine laying around, it will need to go to a shop. I'd suggest, if you want to do some of the work, to replace the condenser and the filter-drier yourself, being sure to replace the orings, then take to a shop for evacuation and recharging. They will add R134 by quantity initially (it is listed on the AC label under the hood), then they will look at the pressures.
The evacuation/recharging station will add the oil to the R134.
I would not use any of these "hot shot" cans to get freon in, the system is now opened and there is humidity, etc in the system that has to be evacuated before recharging, the system has to be in a vacuum to add R134.
Gilly
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