I see these old trucks (12v) run on whatever you put in them, but these new trucks are pretty sensitive to the sulfur content. I was considering a new truck but where I live the sulfur content is currently 10,000 ppm although its supposed to go down to 350 ppm by 2010. Does high sulfur content have any advantages or disadvantages? Why can't the new trucks run on high sulfur?
-Dave

 

They want the sulfur out because of acid rain. To remove it, they remove the lub qualities too. So we end up with a fuel that does not lube the injection pump like high sulfer does.
Now, add a much higher pressure injection system and the need for more lub is there but the fuel doesn't do it.
Yes those old 12 valve motors will run on most anything.
I think I read somewhere that the sulfur is causing an issue with the newer diesels, but I don't remember what that was.
Sulfur does lube by itself.

 

They take out the Sulfur for emissions reasons. The new diesel has Lubricity added to it as it is pumped into the tanker trucks. I personally haven't heard of any issues with the new fuel. I think a lot of the panic was " the sky is falling" mentality.
The New 6.7L Cummins should only use ULSD, the high sulfur will cause the DPF to clog. Look for an 07 with the 5.9 and you'll be fine running the high sulfur diesel.

 

The way I understand it, sulfur itself has no lubricating properties but the process that is used to remove sulfur also removes the stuff that lubricates.

Of course, there's always someone smarter on the 'net that will come along and disagree.

 

So if one were to do the DPF delete and EGR block on a 6.7 you should be able to run whatever diesel you wanted ULSD or better. Right?

 

Wobblin-You are correct. Sulphur in itself carries no lubricity properties yet the refining process that removes the sulphur also removes the lubricity in the fuel. Thus additives must be added to ULSD, at the refinery, to regain it's lost lubricity values. That is one of the reasons of the increased cost in 15ppm ULSD over 500ppm LSD.

The reason ULSD is needed for the 6.7L trucks is because burning fuel with a higher sulphur content creates more particulates. More particulates fill the DPF faster and can clog it. The engine itself can run on just about anything a 12V can. It is the emissions equipment that cannot handle anything other than 15ppm ULSD.

rogers: Yes, once you delete the DPF and EGR you can run on 500ppm LSD all day and all night.

 

Not really. Still want to minimize the soot because of the variable nozzle turbo.

MikeyB

 

As long as you keep using the EB regularly i can't see the added soot from 500ppm LSD hurting the turbo much. The guys running PMT's after the deletes are smoking like crazy and (thus far) i don't think i've seen a problem mentioned yet with a turbo after the deletes. I've run 500ppm in my truck a few times and it doesn't seem to run any different.