Now I'm hearing a hollowed muffled almost bell like sound. It sounds the same cold or hot. When I first started the car in the morning I don't hear no chatter or anything. There is like a little bit of glitter looking stuff in last oil change not much but just enough to wonder. The car is a 2000 Pontiac Grand am 2.4L 243,168 miles ... When at a light in car I can't even tell it is running. Seems loud with hood up and cam rec.... Runs great you will be going 85-90 like crap I need to slow down haha