ZUL8TR, Just got home (actually earlier for a change) I bought a stethoscope yesterday so I will try to listen for noise while the engine is warming up......this is prep for draining the LUCAS out of the system and add the Rotella this evening and see what happens. What is your opinion of this noise? If it is just lifters I could try to put some more miles on it with the Rotella and as you mentioned give it a little time to work. But my original plan was see what happens tonight with the Rotella and if that doesn't help I was going to take it down to the cams and lifters tomorrow night and check the clearance and also see if one or more lifters is seized. Thanks and update to follow!