Oop's...what have I done to my motor???? I did not realize this until I heard the engine clanging over my ipod. Sounds like valve train noise. Have been running full synthetic in it, have 12,800 miles. Had to drive it home about 400 miles, but at low speeds. Still has about the same power and shifts fine but noise at higher rpm's. Am going to change the oil this weekend it looks pretty black. Any idea's, maybe just needs to valve's adjusted?