I read long ago , here :

http://motorcycleinfo.calsci.com/NewBike.html

quote :

"When you take out your factory oil, if you hold it up in the sunlight you'll see the color is very good, it looks almost completely unused, but you'll see lots of reflections from metal flakes in the oil. These flakes are very bad for your engine, and can clog up your oil filter so that your filter bypass is activated, meaning you effectively don't have an oil filter. Notice that the factory says you should still be using the factory oil and oil filter. I think this is insane. "



that the first couple hours running a new engine would generate a huge amount of metallic sludge that it would be good to get rid of as soon as possible. I've applied this to the new honda XR 250 I bought a few years ago and now to my new T�n�r�, but this time the result was much more visible. The oil was a metallic grey and it seems the filter was already overwhelmed by the amount of metal that it picked up. I suppose that running the bike up to the regular 1000 km first oil change with that kind of sludge in the motor wouldn't be a good thing to do (think of all the finely machined parts, such as bearings). Let the pictures speak for themselves : The filter at 100 km first oil change :








Lineup of filters from 100, 200 and 500 km oil changes :