Always no matter what!! Evacuate the system and change the drier pack, plus add the oil. Any stains on the drier is leakage/blow-by and you'd be ahead to replace the compressor too.

Summer is starting here and it's already hotter than a goat's ass in a pepper patch 107f, so this weekend is ac checks for me.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course