I recently switched over to RL 5W30 and the RP 20-820 oil filter from the PUP 5W20 and either MOPAR or Delco oil filters, and I've got 120,000Km's on my 19'.
The brain trust in this forum were very correct in this recommendation, and I am not snake oil farmer either!
I'm now almost 6,000Km's in on this first round with the better oil and filter and I can tell you that even though my HEMI never ticked before, there is a discernable improvement on overall engine sound at idle and at WOT, and in overall performance feel as well.
I was changing my oil and filter religiously at 6,000Km's before, and with the new oil and filter I'll take it to 8,000Km's (5,000 miles) because I can do it with confidence knowing my engine has far better protection now than it did before.
Is it worth the added costs (and those that have read my posts previously know it was exorbitantly expensive to bring in the RL and RP combo from the USA to Ontario, Canada) to go this route; indeed it is!
I don't need an engineering spec sheet to show me that this new combo is providing positive benefits to my HEMI!