I’m late to this discussion, but have a ‘19 Longhorn with extremely bad lifter noise on startup randomly. I’ve collected several videos which I’ll post shortly. Dealer “can not replicate problem”. I changed the oil early at somewhere around 2500 miles using a K&N filter and AmsOil based on feedback from this forum, but it yielded no improvement. Sent several videos to the Chrysler care tech and the dealer service manager. The tech at the dealer said right away, “yep, that’s bad lifters”, but the rep at Chrysler has instructed the dealer to “install no new parts”.
Aside from this I’ve had several other apparently unreconcilable problems with this truck including an insanely loud “teapot noise” when driving at highway speed in wind. Dealer tech reproduced that problem briefly, but said they wouldn’t know how to fix the problem. Sent notes to Chrysler. I expect to hear nothing. 3rd dealer visit to resolve problems. I think I’m going to have to try another dealer and be without a truck even longer.
This is my second new Ram vehicle, the first being a Mega Cab 2500 Cummins a couple years ago that shed a transmission and left me stranded in the first 2000 miles without ever having towed anything but it’s own weight, then sat at a dealership while Chrysler tried to push a rebuilt transmission on me.