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Hi, with normal maintenance I would expect 300,000 miles is easily attainable. If I were you I would suggest oil changes every 7,500 miles.
Let me know if you need anything else.
No, it's not really a new engine but the problem area has been addressed. The piston rings were not replaced and more than likely the cylinder heads with valves were not touched. These items should not give you any trouble with regular oil changes.