Just heard yesterday from my dealer that the new 6.7L's can't run marked fuel. He said it gums them up. They have sold a few to people that run it anyway and it only took about 2 weeks to gum it up. The computer printout from the truck actually stated "use of marked fuel". Anyone else heard of this or had any experience with this? If marked fuel is not an option I may be looking at Ford for my next truck.

 

What do you mean by marked fuel. If you are pertaining to dyed diesel or offroad diesel it will not hurt these trucks at all.

 

Most of the dyed or offroad diesel is still LSD with 500 parts/million sulfur. The 6.7 requires ULSD at 15 part/million. If you use LSD it will damage/destroy your particulate filter, and the truck will stop running. All diesel trucks produced after Jan 1, 2007 are required to have particulate filters and all require ULSD. You won't have any better luck with a new Ford or a Chevrolet. If you want a truck that will run on LSD then get a 5.9 Cummins.

 

I have run LSD in my 6.7 for 90% time it gets me about 3-4 mpg better the truck runs way better on LSD then ULSD. I have talked to chrysler and they have said that it will not hurt the engine or the dpf at all. The trucks are made to run USLD. Doesnt meen you cant run other diesels in it. To be emission compliant you need to run ULSD. Alot people with 5.9s are having a lot of problems with injectors and injector pumps because of the ULSD not lubricating and gumming them up. The 6.7 will not have that problem.

 

That is an old tale about ULSD giving you lubricating problems!
My 2006 Ram 3500 is fine AND gets better MPG with ULSD!
Also my case skid steer with 500 hours on it runs great with ULSD.

If a lot of people are having lubricating problems with there 5.9 (BTW prove first that it was the ULSD and not something else like a Edge, Bully-dog ect.) why haven't we see more complaints about it?

The 6.7L in only for ULSD, just look at Cummins or Dodge's website or ask Luke S. If you use LSD you have voided your warranty.

 

On this website I havent really seen any problems but go look on dtr. I think it is around the 03 years that they are having the most problems. You put bigger tires on you void your warrenty, I could go on for days the things you could do that would void your warrenty but unless they can prove that what you did caused your problems then they have to warrenty it. You can believe it is an old tale, that is why we have to run special oil, etc in the 6.7.I havent looked into it too much but I think you are the first person I have ever heard say ULSD has helped you out in mpg etc.

 

Just a couple of things, Use of any diesel but ULSD will end with less than positive results. Use of "red" diesel will dye the wick in the fuel system and end with no warranty. Dealers do not have to warranty anything, ever, no matter how much you complain. Dealers do not have to prove that anything broke anything. Why is it that some people don't want to follow the guidelines of the company that designed/researched/built the product but cry when the product doesn't perform to their expectations. Sorry for the rant, but what is so hard of using the right fuel and following the service recommendations...

 

so if i bought a 6.7 when they first came out and there was no ulsd in my area only lsd and i used it your telling me i voided my warranty come on

 

YEP, but only if dealer finds out. They have a fuel tester so make sure you put ulsd in before it gets worked on!!!!

P.S. I cant beleive i saw deisel #2 at a citgo yesterday!!!!!!!! Been awhile since i seen that good stuff

 

Can you explain the coomment about " Dealers don't HAVE to warranty anything, ever".... Whats the purpose of the owners manual and warranty book?? WHat if you are all stock like me and intend on keeping it that way???? I think by LAW don't dealers HAVE to warranty the vehicle?? Just asking. Now if you run the wrong fuel, or BOMB IT, absolutely NOT!

 

I hope Parts/Service is refering to people who have already voided their warranty. A warranty is a contract. As long as the consumer stays within the guidlines set in the contract, the automaker has to honor the warranty. It's that simple. If you're stock, you're fine.

HL649 you have voided your warranty. And probably subject to a large fine for running non-taxed diesel on the road. Every diesel truck made 2007 and later must run on ULSD. That means ford too. If you want to continue to run off road diesel, you need to buy an older truck.

 

I have used offroad 90% of the time in my 04.5 never had a issue, with the fuel system or warranty. And I have no reason to cheat the system, it goes in the dealer the way it is. But this week I am getting rid of the 04.5 and getting a new 07, can't pass on the deal they gave me on a new one, hopefully they don't meet the quota this month and will get it out the door much cheaper. I will let you all know because it will have offroad in it, if it denied warranty will let you all know.

ccoop769, I was in your neck of the woods a few weeks ago and seen some #2 over on DaleMabry, close to Busch Blvd. In fact will be there finishing up a job for chevron Monday.

flgc

 

They can not void a warrenty due to running offroad diesel. A farmer buys a brand new truck he uses it only on his farm so he uses offroad fuel, and does nothing else to the truck they have to warrenty it. The 6.7 might be the only exception. Offroad or dyed is pretty much the same thing as fuel at the pump or was the same. If a dealer has told you they wont warrenty it because you ran dyed fuel, they are just trying to make them money and are lying. I dealer doesnt make much money off warrenty work that is why some do not want to do it. Therefor they say that voided your warrenty. On the last note. Everyone that says LSD will ruin your engine, etc. Find the facts that some just run LSD and it ruined there engine. Never heard of one yet. It is rumors that someone said. I wont some proof that it has happened, not (but chrysler said so and they made the truck they know what they are talking about)

 

From the 2007 warranty information book- section 3-what's not covered, 3.6-other exclusions page 15: "using any fluid that does not meet the minimum reccomendations in your Owner's Manual."

From 2007 Owner's Manual- Starting and Operating, Fuel Requirements (Diesel Engines) page 324: "This engine requires Ultra Low Sulfur Diesel Fuel."

So that looks like using LSD diesel is not meeting the minimum recomedations, which the warranty book says is not covered by warranty. I'm sure some people will argue with that, but that's just what I found in 5 minutes of looking.

 

Ummm, sorry thats not true either. If you use offroad diesel in a 2003 and up Dodge, your warranty is gone.