x15 efficiency good or bad

[tree98]

X15 is not proven yet because it's so new. I haven't heard anything bad about them yet, I bought a Pete with the X15 performance. It only has about 18,000 mi. On it so I can't really say much about its longevity. If you want a new truck go for it. Those 870/871 won't be around forever, at some point they'll be the N14 of diesel motors, with no good parts available for them. Not to mention the truck itself, old trucks are old trucks.