My guess would be manifold bolts, just had 3 replaced around 4 months ago. It was really loud @ initial start up. Dealer took care of it with no cost to me. Find a better dealership.
34k on my Hemi using PUP 5w20 with Royal Purpler oil filter. After talking with the owner of a independent Porsche garage ( also with the knowledge I learned about motor oil from this forum, mainly Burla) who works on my Porsche Cayenne S, my next oil change will be Red Line 5w30/Royal Purple...
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