when i got my XT660Z from the dealers i ran it 300km then changed the oil to Motul 10-50W, replaced the oil filter and switched to a OEM magnetic drain plug. There was fine metal shavings and "sludge" all from engine break in.. 2nd oil change was done at 1100km, removing the magnetic plug i discovered a buildup of more particles around the tip however the oil filter was not covered in as much metal.

i think the manuals 1000km is a bit long winded.. JMO