You can file a petition to seal since it has been more than 7 yeears since your previous DUI.
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Will not help. Will make it more difficult for you to later have then unsealed.
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You are eligible for sealing a DUI after seven years passes from the date of closing the case. This does not apply to cases that have been in warrant or are not closed.
Immigration is a different question. I am not a practitioner of immigration, so you would need to consult an immigration attorney prior to initiating the sealing process.