Peterbilt mx or cummins?

You’d think my brother would agree with you after he broke the crank in his but he swapped another one right back in. Lol

 

That right there is the biggest reason I won't own 1.. I see em all the time with windows in the side of the block.. No Thank You lol

 

They sound like they're about to chuck a rod when just driving normally anyways.

 

What a coincidence!
Cummins x15 knocking noise

 

Man I’ll say this. I own an X15. I’ve had the cam replaced and a rocker arm that broke and damaged the cam. That’s the only engine work I’ve had to do. But I’ve changed the front main seal, rear main seal, Valve cover gasket upper and lower gear cover gaskets. Seems this thing needs some sort of gasket every 6 months or so. Mine is a 2018 so keep this in mind when buying used. You’re going to spend $5000+ after you buy used to fix stuff that you won’t find when before signing. That’s how it goes buying a used truck.