Reviews On Cummins X15 Engine

Looking to buy a newer truck and would like some feedback on the new cummins x15 for a new owner operator.

Your question is a variable, what specific year are you talking. There are 3 versions of that motor between 2010-2019.

Series 60 for me.

I believe that the new X15 wasn't built until 2017 and wasn't heavily installed in Pete's and KW's until 2018. I haven't heard much for reviews except from a Pete dealer.

The X15 and ISX are both known for electrical problems, ceramic fuel pump pieces exploding, and spinning the cam bearings. The latter two wipe out the motors quick.

Hopefully it’ll drop a sleeve while still under warranty and you’ll get a free in frame. Otherwise, save your pennies. Pretty much all the motors in the last ten years are good for about 400k then they need work that pre emissions engines didn’t need until around 700k. Enjoy your new money pit.

The X15 is not really new. It is a new version of the ISX 15. Kinda like the difference in a 396 and 402 chevy motor, for those old enough to remember them.

They made some really minor changes mainly to the head and gave it 600 hp. With those changes came the new name. I have seen one in a 2019 389 Pete. We know the ISX had some issues but didn’t show up for a few years. Time will tell on the new version.

I have a 2013 ISX 15 and it had to be redone at 282k because it had a design flaw. The fuel pump was changed at the same time to get rid of the cermaic pistons. Runs great now.

Thank you for the feed back gentlemen. Maybe I ought to find a good old one.

Old big cam 400s would go a 750k to 1 million miles before an in-frame was needed lol

Last 1s I was certified & worked on were the NH 855s