On the off-chance that Volvo used some special oil, additives and/or filter for break-in, I'd keep that in during the period mentioned in the owner's manual. For example, my 2002 Mitsubishi suggests to "take it easy the first 300 miles...," so I made sure to AVOID any changes during that time (not that I'd change oil at 300 miles anyway). At about twice that mileage -- 600 miles, I think -- I figured the engine was reasonably broken in and did an oil change. I agree with RayH that this first break-in oil cycle, by definition, should have a higher amount of particles in it as engine components slough off rough edges and develop a polish, so it can only be a good thing to dump this oil once you're comfortable the engine is reasonably broken in, maybe twice the number in the owner's manual, an admittedly arbitrary mileage.
For the record, everything I've read in these forums and elsewhere suggest that "break in" oil and filters are in fact old school, or if they ever existed at all, now irrelevant. Even Mobil 1 syn oil is now routinely used in new engines both at the factory and on the street, whereas mechanics used to warn about "Use only non-detergents at first..."
[ November 05, 2003, 10:19 PM: Message edited by: TC ]