Well being since how im my own builder (sorry for bragging) I had to inspect the engine for any type of metal shavings. I ended up cutting open the oil filter only to find no metal what so ever. And being since how most pistons seal within the first 20 miles i dont see why an engine would not be broken in with in the first k. (also taking into effect the hours i spent tuning the engine.) Anyways while i was doing an oil change i decided to throw in a 2 way alarm system and some other neat little gadgets. I love how these cars are never done!