I have an 18 Laramie ED 4x4 , purchased late DEC 18. I have just a little over 18k miles . Engine developed a knock at around 9,500 miles. I took it into the dealer, they could hear the knock in the lower end passenger side but couldn't diagnose it and was told to bring it back when it had gotten worse. Well sure enough on the interstate around 70 mph the engine let go finally, major vibration and knocking loudly. Luckily had a rest area right down the road and limped it in. Had it towed to dealer and left it there. Ram asked for oil change receipts as expected. I had it changed with chevron delo 5w-40 full synthetic and mopar filter 2 times by then. No major resistance from Ram at all. MAKE SURE YOU KEEP YOUR OIL CHANGE RECEIPTS!
Engine is being replaced fully , not just the long block, but everything new. Dealer said that Ram wants the entire engine and exterior parts back to really see what happened , Sounds good to me!
The dealer has been great in helping , as well as a RAM customer service agent has been calling about every other day checking with me and dealer on how things are going. To be 100% honest , I called Ram the same day at the rest area and asked for a case manager. Its been my experience in the past that it goes a long way to do this on the front end when there is a major failure warranty issues. She was able to get me a free loaner for the duration and pushed a new crate engine to get to the dealer sooner.
I've not talked to see what it actually is that went south, but Its my guess that it was limited to one piston, engine when initially started knocking , lost fuel mileage about 2 mpg, and the knock would go away at highway speeds but when slower traffic or at idle it would knock loudly from passenger side rear of engine. Also would knock louder under load. Whats your opinions?
Other than this , truck has been perfect. No other issues. I've been a Ram fan for ages and have 2 more cummins in the stable too.
Just wanted to share my recent experience.