Ticking 2007 5.7 Hemi

Hi Folks

Not an A body, but my Ram1500. I've heard these things are known to tick.......Has anyone actually nailed the cause down? My first suspect would be sticking lifters. Seems to lighten up when it gets warm. Right now I use 5w20 (from varying manufacturers, Castrol currently) like the manual says........Any suggestions?

BTW.....180 000 Kilometers. (111 000 miles).

Thanks