Just dropped $1600 into having my sons 2001 Warrior engine rebuilt. New crank, rod, piston, timing chain, one way starter, punched .020 over with a valve job. Put about 5 very easy breakin hours on it and changed the oil & filter. The filter is packed with metal shavings. They get picked up with a magnet so its not the case. What the hell gives? Should I show the filter to the rebuild shop?