[KOG]

If this is the problem then cop cars should have a horrendous failure rate from their constant idling. I can see his points, but I wonder if this makes the hemi very sensitive to various oils. Maybe some oils will overcome the problem. Apparently some hemis run hundreds of thousand of miles.

Just went straight to you tube and looked at the comments on the video there. The problem does seem to be common to cop cars. Lots of comments from dealer techs who've been replacing cams and lifters.

 

[KOG]

Tend to agree with your summary ! In the state of New South Wales where I live in Australia many of the Highway patrol cars are Chrysler 300 SRTs.Little idle time .I personally have seen three which have had total lifter / cam failures in the last year . One would think by now
there would be a definative answer to this lifter failure. Of course FCA Stellantis here state its not a common problem ,! To me the ongoing denial by FCA ,Stelantis of the hemi lifter problem points to an inherent design failure they dont want to have out in the open.Of course I may be wrong!

Yes, you may be wrong, but OTOH FCAS may be wrong instead. And don't even ask me how you pronounce the acronym FCAS. I suspect the person who came up with "Stellantis" didn't put anymore thought into the acronym than into the name. Probably some marketing MBA without a clue. As an MBA myself (but engineering background) I've seen far too many of those clueless types with English Lit or such backgrounds. The same types who make up the majority of Law School classes and can screw up anything they touch.with pure native ignorance.