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Originally Posted by lars-ss
Not to be argumentative, BUT:
The first 1500 mile oil change is critical to getting the metal shavings out of the oil, which are bad for the system but are not going to choke the engine down. It's not going to likely matter much, but who wants those little metal shavings in there increasing friction and reducing mileage? No one does.
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Any "metal shavings" circulating with the oil are removed by the oil filter. That's what it's there for. Yes, there are smaller particles (microscopic) that the filter won't pick up, but those are also smaller than the clearances in the engine, so aren't causing friction and lots of wear. Also, engines are pretty much spotless when assembled. There aren't a bunch of visible metal shavings, turnings, etc. in there. If that stuff was there, filter or not, the engine would be destroyed on its first start up.
Contaminants, including from metals, are high when the engine is breaking in, of course.
It's also true that Hondas do have special break in oil. It's apparently high in Molybdenum additives for break-in purposes. People have had oil analyses performed to find that out. Consensus on other boards seems to be to leave it in there for at least 3K miles or so.