Quote:
Originally Posted by ILUVMILS
In theory, this is correct. In the real world though, the story is quite different.
Nearly all high quality A/C recovery-recharging machines include an oil injection option. Usually, it's simply an externally mounted reservoir, and oil is added as needed. The reservoir doesn't require any special protection, and it's not a sealed unit. Any moisture that contaminates the oil in the reservoir is removed when the system is evacuated (as long as it's done correctly). Obviously, if the machine doesn't get used for an extended period, the oil in the reservoir should be replaced, but there's no reason to open a new, sealed can every time oil needs to be added to an A/C system.
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This is basically my opinion on the subject...we all know everyone has their own opinions, but in reality, one of the reasons you evacuate a system is to rid it (and the oil in it) of most of the moisture in it. Pulling a near perfect vacuum and holding it for even an hour will probably get out 99% of the moisture in the system, including what miniscule amount gets absorbed by the oil...but if it makes people feel better to break open a new bottle of oil everytime they work on an A/C system that's their prerogative...surely the people who make and sell the oil won't want to discourage that
