Funny a lot of people suggest "modern" engine oil when modern engine oil has continuously taken out aw/ep additives. Lifter tick happens to be an extreme pressure condition. I guess 2 plus 2 equals 10 around here, or something along those lines. Look at the high moly additives and oils on the market if rislone ever stops working. I'd say oil soluble ones that are ester based are less risky then powdered moly in suspension, but many guys have had luck with both. But for now,<span style="font-weight: bold"> if it aint broke don't fix it</span>, seams like you found your winner, as long as it isn't corrosive like chlorinated paraffins chances are it is doing more good then harm. They also have none moly additives that attempt to do the same thing, molygen motor protect may be one. Turns out to be tungsten, but there are others as well, titanium and stuff. The paper out there suggests moly is still the gold standard.