This subject may have already been discussed, but I am brand new to this site, and will hopefully be new to cummins very soon. I am looking to buy either a 2500 or 3500 4X4 with the 6 speed manual and manual 4x4 shift lever. I have been doing some research on the pros and cons of the 6.7 vs the 5.9. From my understanding if you are willing to void the warranty, you can completely delete all the emissions crap of the 6.7 and with the help of a tuner make it run right...assuming there are no emission testing in my area, which there aren't. My question is, will the 6.7 after the deletes basically be a larger 5.9? I heard the 6.7 uses a lot of the same parts from the 5.9, and then other parts are just modified 5.9 parts, with about only 10% of the parts being "new" design. I am also wondering if it will then be able to run on all types of diesel fuels. I know a buddy who has a 5.9, and is able to run JP-8 (Jet Propellant, very close to diesel fuel). I have no specific desire to run JP-8, unless i was able to get my hands of a free 55 gallon drum of it, I am more concerned about driving to places that don't have low or ultra low sulfer diesel, such as Mexico. I have no business in Mexico, and actually havent been there in about ten years, but its just the warm and fuzzy feeling of knowing I can throw any kind of diesel there and keep it running.
Second, I would like to hear some opinions from you guys. I am pretty picky about what I want, and finding what i want without ordering a brand new truck isn't easy. I am looking for under 100K miles, cummins (6.7, or 5.9) 6spd with manual shift lever for 4x4. I don't like relying on electrical switches for something easily done with a lever.
with that being said, I found a truck and would like to see if you guys think the price is on par. Clean retail is $30,675. it is an 08 quad cab short bed 2500 ST. it has crank windows, vinyl floors...very bare bone. BUT, that's how I like it. no power window motor to go out while it's snowing and the window is all the way down and it midnight, just raw, reliable truck. Anyway, they have it listen for 24,995. It is first on my list, and if I had already sold my truck I probably would have already bought it. "Luckily" I am still stuck with my gasser 2500 so I have the time to research this.
I know there's a lot on a few different topics, but any help is much appreciated. Thanks guys!

 

Without the Emissions stuff you only really void the Emissions side of the warranty. If you run fuel other than ULSD then you void pretty much the entire engine warranty.

To void the warranty they have to prove that your modifications caused the failure.

With that said I've seen posts from people that run used filtered ATF, 100% veggie oil, and home brewed diesel.

 

Just because there are no emission testing in your area doesn't mean it's OK to remove it, it is still a federal issue with removing the emission equipment. Not saying you shouldn't do it but just giving you the facts to be aware of.

If you do the deletes, and add a programmer like a Smarty, you will have a very good running truck that gets very similar mileage as a 5.9 with all the power you will need.

Or you can look for a 2007 with the 5.9 that meets your needs and add a Smarty to that and never have to worry about the emission junk!

 

With emissions in place, ULSD only! Running LSD are any other type of fuel will damage the BluTec system.

Deleted...It will run on used motor oil and prayers if you need it to

Edit: Also, if you plan on putting fuel additives in you non-deleted 6.7l BE SURE to check that it is 2007+ Emissions safe!!!

 

Thanks for all the info, guys. After reading posts here, I am much more confident with a 6.7...after the deletes.

 

Cool Let us know what you get!!