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Discussion Starter #1
I have an 08 250 that is primarily a tow vehicle. I bought it used with 15k miles on it and it now has 30k miles. It has had two injectors, a radiator, and a bed plate replaced in 15k miles all under warranty. We have recently been pondering the idea of getting rid of the current extended cab truck to for a crew cab since my son is getting a little bit bigger. My real question I guess is I know all about the 6.4 and the issues it can have, and I was getting ready to delete/tune it because the warranty is up. Now I am thinking about gettting a new 2012 6.7. In stock form is there noticeable power gain over the 6.4? How is the fuel mileage compared to the 6.4? And lastly how does this regen process work, and is it just a detrimental to the engine as the way the 6.4 does. Does this engine make oil also? Any info on this engine compared to the 6.4 would be appreciated. Thanks
 

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The 6.4 does have a host of problems but most stem from the egr and dpf systems. it is a BEAST waiting to prove its true potential. my suggestion is soak some money into the 6.4 and drive it til it dies! lol

the 6.7 (if comparing stock to stock) is way more ballsy to drive and has a slightly nicer interior. the trans is also a six speed and the fuel mileage is significantly better. it seems as tho the new 6.7 is not very mod friendly and doesnt have the potential at this time to make big power. as far as issues in stock form i have only seen turbo failures really.
 

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Stock to stock the 6.7 is way better IMHO. Better mileage, more power and less problems. Now a tuned 6.4, totally different story. I consistently get 18 mpg out of my 6.7 where I was only getting 14-15 out of my 6.4 stock. I don't plan on tuning my 6.7 because I really don't see much advantage.
 

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Discussion Starter #4
Stock to stock the 6.7 is way better IMHO. Better mileage, more power and less problems. Now a tuned 6.4, totally different story. I consistently get 18 mpg out of my 6.7 where I was only getting 14-15 out of my 6.4 stock. I don't plan on tuning my 6.7 because I really don't see much advantage.
Ideally I would like to not have to tune anything. My TT weighs right under 10,000 lbs and my stock 6.4 tows it just fine. If I could get a little ore power by going to the 6.7 thats an added bonus. My warranty is running out and with the luck I have had I am seriously thinking about upgrading to the 6.7. I just wish they had been out a little longer so I could get more feedback on reliablity. That crew cab is really enticing too. I loved my super crew F-150. The extended cab is tight
 

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There's some good deals on 2012's now. I'm really enjoying mine but only have 2,500 miles so far. Mpg's are good Hwy 20 MPG (3.31's) if you keep your foot out of it. 800 ft lbs of torque is nice and the six speed is a plus as well.
 

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The 6.4 does have a host of problems but most stem from the egr and dpf systems. it is a BEAST waiting to prove its true potential. my suggestion is soak some money into the 6.4 and drive it til it dies! lol

the 6.7 (if comparing stock to stock) is way more ballsy to drive and has a slightly nicer interior. the trans is also a six speed and the fuel mileage is significantly better. it seems as tho the new 6.7 is not very mod friendly and doesnt have the potential at this time to make big power. as far as issues in stock form i have only seen turbo failures really.
what do you mean when you say its not as mod friendly? warantee wise or reliability wise?
 

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My 6.4L got 11 MPG on the highway in stock form, blew the headgaskets, leaked from the front and rear main seals, blew up 2 A/C compressors, 1 condenser, 1 evaporator and scratched 3 windows. All of this in less than 36,000 miles and before it got tuned.

My 6.7 can gets 15-16 MPG on the highway unloaded and gets about 10-11 with a 8k trailer on the back. I would take a lot of mileage claims on this site with a grain of salt. The 6.7 feels a lot stronger towing. I have not noticed it making oil like I did with the 6.4. Having owned both, the 6.7 is a far superior engine for guys who use their trucks. For hot rodding, the 6.4 has a lot more potential to be fast.
 

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Combustion blow by of unburnt fuel entering the crankcase oil. All engines do it to a degree some do it more! Not really a good thing.
It would be nice if they made diesel fuel LOL.
 

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Ok dum question what is making oil mean.
Is it good or bad?
Regen'ing the DPF requires extra injections of diesel on the exhaust stroke and the fuel washes down the cylinder walls to the crank case. If you regen a lot you could gain an extra gallon of diesel in your case in 3k miles.


Sent from my iPhone using Autoguide
 

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It really is a toss-up of reliability and $$$ in your situation. If you tune your 6.4 and you are capable of holding in the power and keeping it at "no power", then it has the ability to be a very reliable, strong, towing horse, as is the 6.7. The 6.4 definitely needs to be tuned (keep in mind tuned does not mean you have to add HP...it means reprogram your truck's computer to not send it into limp mode once it realizes you have deleted the emissions equipment--which is what plagues 6.4s) in order to be reliable, and is capable of more power than the 6.7. The advantages of a 6.7 other than the obvious new vehicle advantages are it does not need to be modified to be reliable, and has 400 horses of brute towing power. They are really monsters, towing or empty. Presently, owners are finding 6.7's better when not tuned due to the fuel system and turbo restrictions. Only time will tell.

Now comes the $$ part which is the determining factor for most PSD owners. If it's not an issue and you don't care about tuning for more power, why wouldn't you upgrade? If your 6.4 is paid for, or frugality is a concern, tune and delete your 6.4 and let that monster breathe and run the way it was designed to!! You won't regret it.

My 2 cents...
 

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Has anyone bought an XLT using the A plan. My father in law works for ford and I am trying to figure out what kind of price I could get with rebates and A plan. That may make the deal
 

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I drove a 6.4 F350 used prior to deciding to buy new. It was a lariat F350, and really nice. Drove well...but my 6.7 is definitely nicer and feels better to drive. I think the 6 speed tranny is a bonus and lets you tap the power better.

From what I see, the 6.4 has lots of potential if you're willing to invest. But, for me, the 400/800 combination is awesome. I hand calculate every tank of fuel. My worst is 15.2 and my best is 18.8. This is for 30+ gallons at each fillup. So, I am looking at more than a quick snapshot. I have a short commute to work, so this winter I expect to see it drop as I warm up in the mornings. But, that's ok. It's still better than my Tundra was....and while I loved my Tundras...it's soooooooooooo nice to have this amount of torque. I swear it will climb anything in 6th gear.

I have 7300 miles - no issues. I have towed up to 9000# a few times and taken some highway trips. It's just a great vehicle. And...it's funny how many people stop me at the gas station or in my travels and ask about my truck. I don't think I'd get this amount of attention unless I was driving an exotic supercar. Seriously...who stops the guys driving the A8 and asks about it? Nobody...but pull up in a bad a$$ superduty crew cab and 8' bed on 20's and they're checking it out. For all you guys driving lifted trucks...you must be signing autographs! LOL!
 
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