And that's exactly my issue: it's not the first time I'm hearing this, but each time no evidence was shown.
By the way:
http://www.mobiloil.com/USA-English/...ics/Myths.aspx
Quote:
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One of the myths surrounding synthetic oils is that new engines require a break-in period with conventional oil. The fact is, current engine manufacturing technology does not require this break-in period. As indicated by the decisions of the engineers who design the high-performance cars listed above, Mobil 1 can be used starting the day you drive the car off the showroom floor.
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Are they right? Are they trying to sell some oil?