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It is unusual to loose all the oil with a leak, better parts stores sell small cans of oil Freon mix to add some back to the system. The cans say to add one can to a discharged system. The cans come in different colors to match the oil in the system. I am not sure if there is a difference in the oil by color , but I use the same color. If you have a large compressor you can use an air driven vacuum like the one from Harbor freight. You will need a gauge set with three lines to do it properly. A vacuum pump is better but costs a lot more.
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