Dont know what to tell you. Probably has a loose bearing in there and had thicker oil in it previously which helped to cushion the bearing. What did the old oil look like? Was it sparkly, thick, how did the oil filter element look when you had the cover off, did it have some metal settled in the bottom? Has to be coincidence with the oil change. Have seen car engines take out a bearing after fresh oil when the previous owner severely neglected the car by never doing oil changes...the thing was on its way out but by draining the old thick dirty oil out it took away the only cushion that kept the bad bearing in tact.