Are 6.7 Powerstrokes actually unreliable?

A friend of mine said the 6.7 Powerstroke is the worst diesel ever. I’ve mostly heard issues about the first-gen 6.7s, but I’m curious what you all think. How many miles are you guys seeing on these? Are they really that bad? From what I’ve read, the 6.0 seems way more problematic.

Signed: Just a curious guy

There are a ton of happy 6.7 owners out there. Once the first-gen bugs got sorted, they became great engines. Pretty common advice though—never buy the first version of anything new.

Tyson said:
There are a ton of happy 6.7 owners out there. Once the first-gen bugs got sorted, they became great engines. Pretty common advice though—never buy the first version of anything new.

Yeah, that makes sense. First-gen usually needs time to get the kinks worked out.

Sounds like your friend just trashes anything he hears a single bad story about. The 6.7 has been in production this long for a reason.

Quincy said:
Sounds like your friend just trashes anything he hears a single bad story about. The 6.7 has been in production this long for a reason.

That’s what I asked him—if they’re so bad, why are people still buying them? He couldn’t really answer. He kept saying videos only talk about how terrible they are, so I sent him one about a 6.7 with a million miles. Pretty sure he’s just being biased.

@Kerry
I’ve got 330k on my 2017 F350, and before that, I had a 2012 with 370k that needed a high-pressure fuel pump replacement.

Van said:
@Kerry
I’ve got 330k on my 2017 F350, and before that, I had a 2012 with 370k that needed a high-pressure fuel pump replacement.

How much did it cost to replace that high-pressure fuel pump? I keep seeing it mentioned.

@Kerry
Costs vary. A new pump from Ford is around $1,500. If the system gets contaminated, though, you’ll need a disaster kit—rails, lines, injectors—which can run $5k-$6k. Add labor, and it’s $3,500-$4,500 to replace just the pump or over $10k for a full fuel system.

@Kerry
If the pump fails catastrophically and sends metal through the system, it’s over $10k. Ford stuck with the CP4, while others moved back to the CP3. Big gamble.

Clancy said:
@Kerry
If the pump fails catastrophically and sends metal through the system, it’s over $10k. Ford stuck with the CP4, while others moved back to the CP3. Big gamble.

Got it. Makes sense now.

@Kerry
Look up the DCR conversion pump. It’s not just a redesigned CP4—it’s a completely new pump that can’t fail catastrophically. Costs less than $3k and pretty easy to install.

Van said:
@Kerry
I’ve got 330k on my 2017 F350, and before that, I had a 2012 with 370k that needed a high-pressure fuel pump replacement.

The CP4, right?

Ember said:

Van said:
@Kerry
I’ve got 330k on my 2017 F350, and before that, I had a 2012 with 370k that needed a high-pressure fuel pump replacement.

The CP4, right?

Yep, the CP4.2. It’s a two-piston design. The CP4.1 is used in smaller vehicles like VWs.

@Kerry
I’ve got a 2011 6.7 F450. Just keep up with maintenance and delete the DPF and EGR if you can. Mine’s been great apart from an early turbo replacement and some small leaks. Straight pipe fixed a lot of the DPF issues.

Quincy said:
Sounds like your friend just trashes anything he hears a single bad story about. The 6.7 has been in production this long for a reason.

He’s a GM guy :rofl::rofl::rofl:. I come here because I trust you guys more—if it’s bad, you’ll tell me.

@Kerry
Are you sure he’s not confusing it with the 6.4?

Van said:
@Kerry
Are you sure he’s not confusing it with the 6.4?

I’m pretty sure. When I said the 6.4 was awful, he said the 6.7 was just as bad.

Kerry said:

Van said:
@Kerry
Are you sure he’s not confusing it with the 6.4?

I’m pretty sure. When I said the 6.4 was awful, he said the 6.7 was just as bad.

The 6.7 is one of the best platforms out there. It was designed in-house by Ford, unlike the Navistar 6.0 and 6.4 disasters.

The worst diesel ever? Lol, your buddy doesn’t know what he’s talking about.

2016 Nissan 5.0 Cummins enters the chat…