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Is Sea Foam good in the oil of a 7.3 diesel with 550,000 miles?
Thanks for the question. Yes, Sea Foam in the oil will work to reliquefy heavier oil residues and deposits so they can be drained away when the oil is changed. We recommend adding it 100-300 miles before you change your oil so the Sea Foam has a chance to circulate and clean.
Jim D.TECH
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