Like i said the 6.7 might be the only exception, but for the older ones proof. Where are some facts. You can say anything you want, but proof is what we need to see.

 

The 6.7 is backwards-compatible. I think I read it in the owner’s manual of my dads 6.7. Chrysler/Cummins knew that ULSD wouldn’t be everywhere and that some customers wouldn’t be able to run ULSD in their trucks all the time. The 6.7 can run just fine on both LSD and ULSD.

I swear I read that in the owners manual. So if a dealer trys to bail out of a warranty cause they claim the on-road LSD fuel ****** something up, show them that page and tell them to uphold their end of the deal or your getting a lawyer or something.

As for the difference in mileage, we have noticed that the 6.7 get about 1-3mpg better on LSD than ULSD.

As for off-road diesel voiding the warranty, I think it all depends on the dealership your dealing with. Some take their policy seriously and right down to the "T" and others will turn a blind eye to petty things like that.

We got a 100hp chip from our Chevy dealership when we got our D-Max back in 01 and they said, "you buy this chip from us and anything happens as a result of the chip, bring it back and we'll still cover it."
It all depends on the dealership.

We don’t notice a power difference between LSD and ULSD.
Its kinda hard to feel shy on power when you got a dually, 6spd manual and 650lb-ft running through it all.

 

My owners manual says:

(page 325-326)
"Fuel Specifications:
The Cummins turbocharged, charge air cooled, diesel engine has been developed to take advantage of the high energy content and generally lower cost No.2 ultra low sulfur diesel fuel or No.2 ultra low sulfur climitized diesel fuels. Experience has shown that it also operates on No.1 ultra low sulfur diesel fuels or other fuels within the specifications in the following chart. ...sulfur content-maximum of 0.0015% by weight." (which is ULSD)

It also says (page 324): "This engine requires Ultra Low Sulfur Diesel Fuel. Engine and exhaust aftertreatment system damage could result if the incorrect fuel is used."

nowhere does it say you can use a fuel with more than 0.0015% sulfur by weight. Which basically says you can use any ULSD you want, but only ULSD.

 

That is true but they do make dyed ULSD We have to run it in the motors at work because of emissions so dont worry guys its not just normal trucks. I work on a drilling rig in the oilfield. Last summer they put a million dollars into a testing project for out motors cat 3412s I think is what most of them are. They put catalatic converters on them with urea injection. Didnt help at all. Back to the subject. The main thing depends on the dealership. Some will warrenty everything some will not. The only thing that my dealer told me that he might not be able to warrenty is the exhausr system since I took it off. The chip intake and running dyed diesel he said it would be alright. A lot of dealers probably wont do that though it depends on the dealer.

 

I don't know about dyed ULSD. I don't think it's very common. I've never seen it around here. I suppose you'd be OK unless the dealer just saw the dye and assumed it was LSD. But then they should be able to tell the difference b/t ULSD and LSD. I wouldn't run it personally because they do come around and dip tanks a couple times a year usually.

 

If you want facts, research the introduction of ULSD in both Australia & Europe. Everything was fine for the first 50k miles - then all the fuel components, that all the manufacturers including Cummins said/warranted would be OK, started to fail, mainly with the rubber parts. Manufacturers had to do some fancy back pedaling and came up with some quick fixes which were incorporated into the next year production. We, the consumer, have now become the R & D for most manufacturers now. So the warranties should at least cover the "learning" period for both us & the manufacturers/dealers. I believe it is the manufacturer that warrants the product not the dealer.

 

Dont know if the transport fuel to the pumps but western petroluim based out of vernal, utah is where we get the dyed ULSD. And gm scott that is true it was the ulsd that hurt them there fore the 5.9 will have the same problems but the 6.7 shouldnt that wont mean it wont happen to them though

 

I agree with you erics76. The owners manual planly states that you are to use ULSD. Evidently they have designed these engines for ULSD or they wouldn't tell you this. Why would anyone risk damage to there engine or a voided warranty by using LSD? I don't know but maybe this why so many people are having trouble with there DPF's???

 

Also, why would someone buy a 2007 6.7 and then spend their time and money to take off the EGR and DPF, when they could have saved their money twice over and bought a 06 or 07 5.9 without any emissions on them? I don't know. I think these questions cannot be answered by people who use logic.

 

Sounds like were splitting hairs here...when i bought my 05 the only fuel out there was the low sulpher ( the same diesel as red fuel just no red dye)
it was the 06 models that was designed for the uls fuel.

I use Lucas to offset the loss of power and lubrication in the uls...which i'm sure some dealer can say that voids your warranty!!! Dealerships hate to do warranty work they don't make anything on parts and get paid very little for the work itself.... vs retail on parts and another flat rate manual on paying jobs.

I must be getting old I can remember the days when Detroit made trucks they would stand behind.. now all they make is excuses! What do you think Henry Ford would say about the PowerJoke.....his motto was "hard to break easy to fix" Now it's easy to break and no your warranty does not cover you...

 

Because My 6.7 with 37" tires stock could out run my buddys 07 5.9 with bully dog triple dog set on extreme and a cold air intake. You do the same with the 6.7 as you do the 5.9 the 6.7 will flat out smoke it. Before you say it the c&c are different then the pick ups. My edge is a 100 hp chip and it will out pull trucks with stacked chips, intake, and exhaust.The 6.7 is an incredible engine all the people in my town know that from seeing me dyno and sled pull etc.

 

The reason that ULSD is now required at the pumps is because new diesel trucks are required to have diesel particulate filters and the higher level of sulfur in LSD will damage the particulate filter. Many stations have been pumping ULSD for over a year, and all stations were required to switch to ULSD by 1/07 once there stock on hand was depleted. Pumps are supposed to be labeled that they are pumping ULSD so that people with trucks built after 1/07 will know that they are using proper fuel in their vehicles. I don't remember exactly what the time table is, but it won't be too long and all off road diesel will also be required to be ULSD, and I suppose some is already. It is not the die in the fuel that causes the damage and voids the warranty, but the increased sulfur level if it is LSD and you run it in a truck with a particulate filter. If dyed diesel is ULSD it won't hurt your particulate filter, but it is illegal to run on the highway and the fines if you get caught are really breathtaking.

 

I've been in 2 non-c&c 6.7L 07's. One a 2wd auto and the other a 4wd 6speed. They are faster than the C&C's as they should be since they have more power from the factory. They run good, but stock to stock they weren't much faster than the 5.9L's i've ridden in. The 2wd auto was running neck and neck with my friend's 04.5 auto with an Edge EZ. I agree that the 6.7 is a good engine, I just don't see the point of pulling all the emissions equipment because it seems that the computers are too smart for that and the truck are going into limp mode. So all that time and money was wasted.

 

Me too, but AMEN brother!

 

Ok we have got to get some things straight here, before ULSD on highway fuel had a sulphur content of 500ppm and i'm not sure how high the sulphur content was in off road fuel. now with ULSD the sulphur content is 15ppm and off road fuel is 500ppm. Now it clearly states in you owners manual to use ULSD only and a only CJ-4 rated engine oil in a 6.7l. A 5.9l cummings can burn 500ppm as well as 15ppm and can use the cj-4 engine oil as well as the CI-4 oil.
As of october 2006 all diesel fuel sold as "on highway" and required by law Must be ULSD and should be marked ULSD BUT!! i have found that the stickers on the pump still read 500ppm when in fact your getting ULSD.
off road diesel fuel in 2010 will be 15ppm and god only knows how low the on highway fuel will be. I would not run any dyed diesel or 500ppm fuel in a 6.7l