That’s interesting advice. Machining is far better than years ago.. one would like to believe there will always be traces of wear metals etc especially the first 1,000 or so miles of an engines life. The biggest thing I heard of is keeping rpm’s within a range and driving with different loads minimizing red line until at least 1,000 miles or so. Doing so is good to seat the piston rings. Can I be wrong absolutely does this make sense also absolutely. Maybe just old advice from my friends father who built race engines for motion performance in Baldwin ny back in the 70s. Now leaving those wear metals to assist with break-in that sounds a bit wonky. Maybe speak to a metallurgist about this lol.
Now as for changing oil out early I don’t think there is harm in changing the initial factory fill within 1,000-2,000 miles especially since the vehicle could have been sitting for awhile or even test driven hard etc who knows. But yes I’ve always changed factory fill out at 1,000 miles with a new filter it’s good practice especially if you plan on long term ownership.
I had a 98 F-150 with a rebuilt 4.2 bored .30 over and that mechanic recommended coming back to him or doing so myself to change the oil and filter out at two, 500 mile intervals.
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