So I'm having the same issue on my car, I read most of thread. I know this is an old thread. So I'm hoping someone by now found or pinpointed the issue.
I don't believe it has anything to do with oil. I was using Castrol before I switched to Liqui Moly and noise it still there. I noticed the ticking noise more as the weather got hotter. Also, I noticed the noise after I installed TMS test pipes and pulley. Not saying test pipes or pulley have anything to do it, I'm thinking maybe something may be loose. Once my car cools down, I'll take a look.
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