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Hi JJ
In my experience, this stuff isn't exactly rocket science. Most likely, you have gotten most of the oil out of the comprssor. Most of the oil winds up in other places, like the hoses, the receiver-drier, condenser, etc. Put in what oil you can, rotate the compressor, put in a bit more, then install and hook up the lines. But be clean, clean, clean. Take the remainder of the 200 cc of oil and pour it somewhere in the system through any of the lines you remove to change o-rings. In my experience, some of the old oil hides in the evaporator--a little dried compressed air will blow it out (and all over the engine, but that's life.) The refrigerant will carry the oil throughout the system once the compressor starts. In general, you want to remove all of the old oil, but that's not possible, so do what you can. I have converted several systems and have had no problems. In my experience, the 88-up 760s have systems that handle the conversion better--but even mu old '84 670--with the ancient York one-lung compressor (looks like a stripped lawnmower engine) worked OK with the R-134a refrigerant. The condenser pressures are quite a bit higher than with the overall better R-12, but the Volvo condensers can handle it. Good luck.
-Steve
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