Transferring oils for long term storage

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So I understand this right, with the argon already filled in the vial , as you add the oil in it will displace the argon until you have it full of oil the remaining space will be argon correct?

That'd be the idea, yes. Since argon is heavier than air it should stay in the vial even with a vent. You could fill a vacuum sealed vial with argon and then when you fill with oil, use a vent needle same as you normally would and it 'should' only displace the argon needed to allow for the oil volume.