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As you can see from the current answers, there are differing opinions on just about everything regarding break-in.
I knew some guys that worked on motorcycle racing teams in my younger days and talked break-in extensively. I subscribe to the camp that one should use heavy loads while gradually increasing your RPM limits over the first 50 to 100 miles in order to facilitate as much ring pressure against the walls as possible. This also means that you are scuffing the hone as much as possible. Which means that you should see a larger amount of material/particles in your oil.
So I try to do an oil change as soon as break-in is complete - say 100 miles. Unfortunately, since my 1LE pickup was a major road trip, I didn't get to do the first oil change until 750 miles, which I considered dangerously late, but that's me.
I would like to point out that regardless of break-in procedure, the largest deposit of metal particles your engine will see is in its first few miles of operation. So as far as I'm concerned, everyone should be doing an early oil change to get those out.
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