Regular oil level yes. Cold start but the video was taken after about 10 minutes running(auto start) in about -7 degrees Celsius. Heat on max. Haven't checked manifold bolts but would an exhaust leak make that odd clatter noise? I understand the tick noise will be caused as these Hemis are known for it but I'm more so trying to diagnose the clatter. Again, maybe it's a natural noise and I'm not use to it as this is my first Hemi. My last truck was a 6.0 power stroke that liked to leak fluids lol and was a constant battle of repair.