Some recommend going on break-in procedure and oil for up to 25 hours. My experience is that if the engine isn't broken in at 10 hours, it just isn't going to happen. The only possible exception is channel chrome jugs which might take slightly longer. But if you do the right thing during those first critical 2 or 3 hours of break-in, you'll get good ring seating and low oil consumption every time. Include your CPA member number in all correspondence.
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