Updated at 6:57 am on 1 June 2012
Refining NZ Ltd made $23 million in the two months to the end of April, after processing 6.6 million barrels of oil.
The refinery operator says average gross refinery margin stood at $US3.99 per barrel with the average exchange rate of 82 US cents.
It says the margin and output were affected by a planned maintenance shutdown.
Copyright © 2012, Radio New Zealand
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