Thanks for the info. I followed dieselgiant's procedure a couple of years ago and used bg-frigi quiet. The system was evacuated and opened because the compressor needed to be removed due to an allen bolt being stripped while removing a bad vacuum pump.

The system was blowing cold and ran great. Now, I've been reading that BG-frigi quiet shouldn't be used or only 2oz used in the system. I wasn't planning on flushing the system or replacing the expansion valve since the system was working perfectly.

I plan on removing the compressor and draining it completely. Then replacing the r/d. Then add 8oz of mineral oil, pressurize with nitrogen and pull a vacuum.

There may be a little bit of the BG- frgi quiet still in the system but, since others use 2oz as an additive, I'm not sure it matter if the system isn't flush and it might help.

Would you flush the system?

Thanks.

pete