My story with this..
forum.ih8mud.com
Did the change, trd filter, (not at all the first one), had the rattle more than a few times. short-interval change with fresh oil and OE filter, still rattled occasionally.. but eventually quit. In the meantime I switched to 5w-30 and back to TRD filters. Hasn't had the rattle in over 20k for me.
Oil change then cold start rattle 3 days in a row.
forum.ih8mud.com
Did the change, trd filter, (not at all the first one), had the rattle more than a few times. short-interval change with fresh oil and OE filter, still rattled occasionally.. but eventually quit. In the meantime I switched to 5w-30 and back to TRD filters. Hasn't had the rattle in over 20k for me.