A newly made engine bore and piston are not purely smooth. It will have slightly rough surface and as we keep using it, metallic powder will be formed due to the friction of piston and the surroundings. And slowly the piston and the bore will be smoothened too. Now this metallic grains formed due to friction will get mixed in the oil that the whole engine is immersed in.
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If the engine is used hard (by opening the throttle a lot), the piston will move very fast and the metallic grains in the oil can cause damage to the smooth metallic surfaces, piston ring and other engine parts. That is why the speed (in fact engine RPM) has to be kept low.
By the time of first service the engine oil will be containing a fair amount of metallic grains and also the oil filter, will be kind of clogged. That is the reason for oil and oil filter is advised to be change during the first service.
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