I'll post just b/c I tried this about 9k ago with good results. Do the searches, though, as well, to get lots more info.

I have a '95 Trooper with 105k+ miles on it. At 96k I put in about 1/4 can of Sea Foam just prior to an oil change. By just prior I mean about an hour before. I then ran it up and down the street for that hour, trying to keep it above 2000rpm. I then changed my oil, switching to Mobil1 5w30 (could not find the 0w oil). Since then, I prolonged my intervals to 5k between changes and for the past 9k the ticking has all but disappeared. Rarely I will get it on a cold morning but even then it lasts for less than 3 minutes, and the ticking sound itself is much less than it used to be.

Just my $.02.