I agree with Larry, with one caveat. Overcharging the system can definately cause oil leakage at the shaft seal. BTDT. In my case I never found out whether it would stop leaking when the charge was corrected because the compressor seized first. But it cooled great right up until the moment it stopped working (on a road trip to west Texas, 400 miles from home. Oops.). I remember thinking the compressor seemed to be making some noise that I did not recall hearing earlier. Thought to myself that I should look into that someday. Someday never arrived...

So, two comments. First, you would be surprised how easily the power steering pump can dirty up and lubricate the compressor clutch. My '87 wagon had a brittle and cracked return hose from the self leveling reservoir to the pump. It didn't leak more than a couple ounces a year, but it was enough to keep that part of the engine bay filthy, especially the compressor. Got fixed when I accidently broke the brittle hose while working on something else. After that, it stayed amazingly clean.

Second. If you're worried about losing oil from the system, have two ounces added. There are gadgets available that shoot the oil in using a little bit of refrigerant, or find a good a/c specialist to do it. Shouldn't cost much, and only a small amount of R-12 is required to propel the oil in.

Finally, the compressor needs to be removed to rebuild it. Pulling the compressor out of this car is a 10 minute job, there are only three steps required. 1) Remove tension on the serpentine belt (1 minute). 2) Unbolt the manifold hose assembly (6mm allen head socket, 1 minute). 3) Remove four bolts holding the compressor to the engine. (12/13mm wrench - I forget which, 5 minutes.) Unplug the electrical connector and maneuver the compressor back, up, and out of the engine compartment. It will come out the top.

Good luck,

- JimY