This took just a moment to find:
This is a little bit of a stretch for tow vehicles but since the Ram's have the 6.4 Hemi option it kinda fits. I have a Challenger 392 SRT with the 6.4 and it developed a tick at 24K miles (believe it or not, it's been babied). From my research before buying, this engine does not normally...
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I’ve also seen it, so to say. My understanding is the MDS components and method are the same, across the Ram/Dodge engines. For a short time, I was assigned a 2014 Ram 5.7L 1500, as a patrol vehicle. I used it for a couple of weeks, after I struck a deer, in my normal assigned vehicle. On my days off, I had to let another guy use the truck. When I went back to get it, for my next week of work, I was told I couldn’t use that Ram. At around 113,000 miles, it needed a new engine. I was told the guy who was going to use it, on my days off, took it and a few hours into shift noticed it was not running right. Supposedly, there were no codes, at that time. By the time he got it to the shop, it was done. When our Ram dealer was contacted, they said it was common and knew exactly what was needed, to do the swap. Within a couple of months, another one of our Ram 5.7L 1500’s started having issues. These were caught quick enough to replace just the failed parts, instead of the entire engine. It was a 2015 or 2016 and had just under 100k miles.
I agree the Ram 6.4L is a pretty good engine, but not once it gets “higher mileage”. If they were to develop it, without the MDS, I believe it would be a spectacular engine.