What oil filter you use? Im thinking stick with mopar but would like a full synthetic one.. Possible mobil one ext perform 20 k protection
If you read and review enough of the information out there. Get an understand of the block configuration and lifter layout it becomes evident that the Hemis that idle a lot, i.e. police cars, trucks used commercially etc. that see more idle time then drive, time will tend to have the problem.
IMO its due to hot spotting which naturally occurs in all engines sitting at idle for long periods, accompanied with valve train (i.e. lifters) being closer to horizontal then vertical, add in that the valve train is the last / furthest from the oil pump in the flow path, and you have the perfect opportunity for varnish to build on lifter body.
Couple that with being a roller vs flat tappet, the lifter body does not oscillate / twist in the lifter journal while in motion as a flat tappet will, therefore varnish build up due to hot spots with limited oil flow and you start to have lifters that stick ever so slightly for only milliseconds. However, that millisecond results in a gap between cam and lifter roller resulting in a higher than designed impact between roller and cam face. This results in impact damage to needle bearings that overtime break or become dislodged from roller shaft. Result is more gap, more impact, and the cycle feeds on itself, first resulting in roller "skidding" on cam face, eventually the roller actually ends up on the lifers "roller" shaft and the shaft support arms on each side make contact with the cam. Enviably you have total failure.
Now there was a change made to 2016 -2017 and newer. The needle bearings are larger then previous generations, and there is an additional oiling port in the lifter body. IMO the idea is that the larger needle bearings will take more "impact" and the oiling port is to help increase oil availability between lifter body and bore. This will help decrease hot spotting as well as provide the presents of more oil and thus more "cleaning" of varnish thru the oils "cleaning" properties added in todays oil manufacture.
Just to be clear, I am not an engineer, nor mechanic. I am a car guy and have been one a long time. To anyone skeptical of this theory I would say look at the block design, the lifter geometry, oil path, etc. I believe it is self evident once you understand the parts, and how they operate in the system and look at every thing as a whole........
But then again I have also been know to be wrong....... Just ask my wife on any day ending in "Y".