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I have never seen anything mentioned in any AC forum or book which would suggest that the color of the oil in the AC system might correlate to the amount of oil... or the need for oil in the system...
The only way I have ever seen anyone say the correct amount of oil in an AC system could be determined was to flush the system and measure the amount put into it.
A PAIN, YES, but the only reliable method I have ever heard of.
And you do NOT want to over fill any more than you want to be low...
If the leak was at a high point in the system...and you saw no oil smudge at that location and you know you had the correct amount before the incident I would not add any.
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