what was wrong with the old engine as the oil could be left over of the previous engine as youve said your not using any oil. the 1.6 if not looked after properly with regular oil changes will gung everything up. had them with oil in the brake servo unit before and every pipe including the intercooler. You should maybe consider removing everything exhaust/intercooler/air flow pipes etc etc and clean the loot out with degreaser as recomended by the manufactures