Join Date: Jul 2011
Location: Prince Albert, Saskatchewan
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Could be just aerated lifters, this can happen on new 3.6Ls just from sitting on dealer lots for a while. It takes a bit to to prime them with oil again.
Diagnosis steps states: Run the engine between 2000 and 3000 RPM for three to five minutes. Return the engine to standard idle speed for 30 to 60 seconds. Evaluate noise. If noise is present, repeat the process an additional 4 cycles. If noise is present after additional cycles, take the vehicle on a typical drive cycle.
I say start with that. Also, don't bother looking at 2018+ Jeep forums for an answer. JL Wranglers have the 3.6L Pentastar upgrade, which is a very different engine from the classic 3.6 in the Challenger. They share just a few minor parts like some bolts, oil filter, maybe some gaskets. Any pattern failures or defects on one likely won't apply to the other.
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// 2016 Dodge Challenger R/T Scat Pack 392, TR-6060, Billet Silver, SPAG