Yes, any engine with 130K on it is subject to make some noise, but mine has developed what appears to be some chatting lifters. I am NOT interested in making it go away with a re-build or anything like that, but I would like to muffle it.
The problem seems to be more noticeable when it is warm out for some reason. I expect the oil is thinner and draining down from the top.
Anyway, I have used Greased Lightening additive which is a small bottle of PTFE. Worked great as far as the lifters are concerned, BUT not a fan of PTFE. Currently running w/o any additive.
From reserach I have done in the past, PTFE can cause troubles with clogged oil filters, so I really don't want to use the stuff.
Was wondering if anyone had any good experience with an oil additive that ACTUALLY woked w/o any bad side effects. Oil additive are mostly bunk, in my opinion, and they are all different. But thought I would put this out there.