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Old 07-25-2018, 09:51 AM   #10 (permalink)
Piotrsko
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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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