The major issue with auto a/c is the rubber hoses witch allows the freon to escape. The lube oil molecules can't leave by the same process so it remains. Unless the fittings and hoses are greasy you don't need oil.
My 15 year old home system hasn't leaked much at all.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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