valves
I got less 'clicking and ticking' after I adjusted my valves at 50,000 miles. I found that all 16 needed about 4 thousandths backing off, due to the usual valve settling that occurs with usual usage. (If you haven't had the valves adjusted at all, consider)
However, I doubt that this would cause ticking. I rather suspect the thin oil and a lag in lube to the area at low rpms and early in the drive cycle. (I think I have a lot less ticking after all is warm and operating for a few minutes.) As most of us drive in the low rpm ranges for mileage benefits, I bet the oil flow is far from the max engineered for the system. Anybody think about a different oil pump, or gearing up the stock system? (Is that possible, as I think it drives off central shafts, rather than a drive belt?)
Jerry