My 2004 just broke 4000 miles and it seems as if my valve clatter is getting noisier. As this is my first diesel I really don't know whether this is normal or not. I get the clatter as I first take off and then again as I crest 2000 RPM. Just sounds as if something is a tad loose. Anyone else experience this in their 04? My buddy just bought a 600 and his valvetrain clatter is nonexistent. Matter of fact his motor is quiet as a church mouse. Looking for some advice from all experienced diesel owners?