My 03 WJ 4.0L has had a tap in the valvetrain or lifters on cold mornings. It stops when it warms up. I know you guys have heard this before. I was alright dealing with that but just did an oil change and now the tapping is there non stop. I had put in Rislone with oil in hope to quite the noise down but I think maybe because it is so thick it made it worse. Has anyone found a solution to this problem? Going to drain it again and see if a lighter oil like 5/30 will help, but I know of plenty of WJ's where thinner oil does not help. Anyone have any suggestions? If you know the problem I speak of then you know that no additive will cure this, looking for the real fix. Only additive that I ever thought came close was Seafoam. I have heard a variety of theories, want to hear yours though.
PS- It is not a manifold leak or injectors, so don't ask