True, but don't forget, I can get dealer parts, for way the hell cheaper than the dealer will sell to me when working on my car. Just doing that, saves a couple of dollars.

And my dealer, by my house, the rate is 145 an hour. My indy, is 75. The dealer needs those labor rates to keep the whole building working. And indy doesn't have so much overhead.

Noob question here. If I emptied the AC system and replaced the AC condenser (under the dash), do I need to add any refrigerant oil?
If I do, where do I add it?

That is added when you recharge the system. I suspect you changed your evaporator up under the dash. Did you have a leak?

No leak, believe it or not just preventative maintenance!
Was changing front carpet so changed it as well.

Just don't know if I need to add oil and where to

You should have the PAG oil added when the recharge happens. If my memory is right, it's 2oz of oil. This should be done by the shop that evacuated it for you. I sure hope you didn't just vent the R134a to the atmosphere. If you did shortcut it...have it recharged at an authorized AC shop.

Anytime you have the system open you have to have it evacuated afterwards to get any moisture out and in my case the condenser had to be changed as there is 30% chance that the oil in the system will slug it..

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The reason for oil slugging is guys adding oil with the recharge without measuring the oil in the compressor. The oil level in the compressor needs to measured and then oil to be added calculated from that. Adding the standard amount for the component replaced(2 oz. for evaporator for example) is close enough only if there is the right amount of oil in the system to begin with.

Thanks I understand I need to find an AC specialist to evacuate moisture and then measure oil in the compressor and add the proper amount. Looks like you gotta do it right not to screw it up. Hopefully the specialist doing it will know what he's doing!

To test a system, have someone remove all the R134 safely. Next, replace the valve stem cores! A $2 part will ruin a system. It's the weakest point. Over time, the valve stem ports will leak. I've repaired so many systems by replacing the core stems. Most of them were quoted entire A/C system rebuilds. Only have a few did need rebuilding only because of compressor failure. Once all the R134 is out, put vacuum on the system. Vacuum from 45 min to 1:30 min. Close the hose valves and turn off the vacuum. Don't remove the vacuum/pump hose. It should hold vacuum down to 26 Hg. If vacuum goes above 24 Hg, I start looking for a leak. If it holds below 24 Hg for 30 min or more, I charge it up.

You can buy a cheap pump at Harbor Freight or Craigslist. Hoses are cheap too. Anyone can test the system. Replacing parts takes more skill and time. I learned from a seasoned mechanic. It's the one skill he taught me that has save me the most money.