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Simple...
The AC system is a closed system, and dos not "use" oil like an engine.
So, you only add oil when the system has been purged and flushed, or when it's being converted to another refrigerant.
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"We drive into the future using only our rearview mirror."
- Marshall McLuhan -
Scott Longston
Northern California Wine Country...
"Turbos whistle, grapes wine..."
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