Ist Question? Are you using Mobil 0w40 oil as recommended?

If not, that may be your problem.

And, you really should get the rev's up.

What is your reservation about not revving it above 3500 rpm?

I had my car in storage in the winter for 6 months. (It's cold in Idaho), and I had a ticking at start-up which disappeared as soon as I used it.

My guess is that you need the correct oil....

BTW, when did you have the oil and filter changed?

Bruce